The Grayl Ultralight is here!

I remember a long time ago, while traveling through China, where I saw a guy with a garbage bag full of disposable plastic water bottles, refilling them from a bathroom sink. So not only does bottled water come with a 280,000% markup, but sometimes it’s not even good.

And if you thought this was something that happens just in sketchy bus stations in China, you’d be wrong. About 25% of bottled water in the US is just tap water. Sometimes filtered, sometimes not.

As someone who enjoys budget travel to out-of-the-way destinations, I’ve spent the last several years keeping an eye on simple, portable, reliable water filters, preferably contained entirely within a bottle, that can handle the sorts of contaminants commonly found in chemically-flavored tap water, bacteria-filled mountain streams, and virus-hiding third world village wells. The number of convenient options that can handle all three of these challenges is, like…five or sixIn the world.

So that’s why I was so glad to see a new one show up on the scene a few years ago, which can handle all of those challenges just fine, without requiring any awkward hoses, breakable mechanical pumps, slow-flow straw sucking, or any other nuisance like that. It’s called the Grayl, and it works just like a French press. Fill it up, press the filter, and drink. That’s it.

When I reviewed the original version of the Grayl, I mentioned that its filtration capabilities were as good as anything you can find, with a cost-effectiveness on par with industry heavyweights that have been around for years, and a simplicity (and elegance) that you’re not likely to see anywhere else. The only potential issue, especially for lightweight backpacking, was that it was pretty heavy, coming it at about 20.75 ounces.

Enter the Grayl Ultralight, the update that solves the only real problem the original ever had. It offers the same great filtration performance, using BPA-free plastic to bring the weight down to 10.9 ounces. It feels like a totally different product now. Grayl gave me a couple test samples and spare filters, and, given how it’s currently doing on Kickstarter, there are a lot of people just as happy with it as I am.

If you’re familiar with the original, you already know how it works, as they function identically. But if you’re new to the scene, all that info is in here too.

The Grayl Ultralight, in review

Here it is:

Grayl Ultralight colors
Available in stoic grey, and mountain rescue safety orange.


  • Height: 9.625″ (24.5 cm)
  • Width: 2.875″ (7.3 cm)
  • Weight (empty): 10.9 oz (309 g)
  • Weight (full): 30 oz (850 g)
  • Capacity: 16 oz (0.473 L)
  • Filter lifespan: 300 uses (40 gallons/150 L)
  • Estimated Retail Price: $60 (includes one top-of-the-line Travel filter)

The big story here is the weight, which is about half as much as the original stainless steel version. For reference, a stainless steel Klean Kanteen of similar capacity is about 6 ounces (170 g), so the difference between having a filter and not having a filter is a mere 5 ounces. That’s about the weight of an average men’s t-shirt.

But as an added bonus, it’s also estimated that it’s going to retail for $30 less than the original stainless steel Grayl (now called the Legend), and $20 less than the hybrid steel/plastic version (known as the Quest). For lightweight backpackers on a budget, this is a win-win.

Filtration performance

I’m going to segue into a minor lesson on filtration and general water-related safety for a moment. The way I look at it, there are three broad categories you need to worry about when it comes to water quality:

  • Particles, whether it’s dirt, dust, or sediment, but also heavy metals and chemicals, like lead, arsenic, chlorine, and many others. These can be found in ordinary tap water, and certain rivers, or lakes, and so on. Most carbon filters can handle this, and it’ll also make the water taste nice and clean.
  • Bacteria, like E. Coli and Salmonella, but also bacterially-sized things, like protozoan cysts, such as giardia and cryptosporidium. I group these together, because if a filter can handle bacteria, it can handle the others. You’ll need something that can handle this category (and most likely the previous one) if you’re hiking or otherwise enjoying the great outdoors.
  • Viruses, which is where many filters fall short. They’re significantly smaller than bacteria, which means you need a much better filter to handle them. Oh, and when people say their filter can remove viruses, you want actual numbers. If someone says “hey, we remove viruses!” but don’t say how many, that’s probably a bad sign. You won’t run into viruses if you’re just hiking around in a modern country, but if you’re heading someplace like rural Africa or the Amazonian jungle, you’ll want something that can handle this category (and the previous two).

Conveniently, Grayl’s filters come in exactly these options:

Grayl Ultralight filter options
With color-coded simplicity.

From left to right, those are the Tap, Trail, and Travel filters, conveniently named for exactly what they can handle. The Tap filter is for filtering water at home (filtering particles); the Trail filter is for outdoor hiking (filtering particles and bacteria); and the top-of-the-line Travel filter is for international travel (filtering particles, bacteria, and viruses), or for any seriously questionable water source.

This allows you to use only the filter you need, such as using the Tap filter at home, and swap it out for a Travel filter when you’re heading off to the Sahara or someplace like that. Each filter lasts 300 uses, or 40 gallons (150 L), and will slow down when it’s time to replace it.

Update: Grayl has streamlined the replacement filter options, and now offers either the Tap filter or the top-of-the-line Travel filter (which has been renamed the Purifier). A lot of customers were asking which filter was appropriate for which situation, and this way they don’t have to worry. Use the tap filter at home, and the purifier for everywhere else. As an added bonus, they’ve dropped the Purifier price from $40 to $25.

Here’s the performance of each:

Tap filter ($15) removes:

  • Chemicals and metals, such as chlorine, iodine, lead, arsenic, and others. Also improves flavor and odor.

Trail filter (discontinued) removes:

  • Chemicals and metals, such as chlorine, iodine, lead, arsenic, and others. Also improves flavor and odor.
  • 99.99% of bacteria
  • 99.94% of protozoan cysts

Travel filter ($25) removes:

  • Chemicals and metals, such as chlorine, iodine, lead, arsenic, and others. Also improves flavor and odor.
  • 99.9999% of bacteria
  • 99.999% of protozoan cysts
  • 99.9999% of viruses

Yes, count up those 9s on the end. I am not aware of any filter that matches this level of performance (most of them don’t bother filtering viruses at all), and even fewer that also offer the convenience of a bottle, which, if you haven’t tried it, is the only way to go.

Using the Grayl

Nothing says “elegant simplicity” like a minimum of components.

Grayl Ultralight components
Outer cup, inner cup, lid, and filter.

Just fill it up:

Grayl Ultralight filling


Grayl Ultralight pressing

And drink:

Grayl Ultralight drinking

It’s really just that simple. There’s no pump to break; no batteries can run out; no iodine to ruin the taste; no hose to uncoil and put away afterwards; no bag to hang up on a branch; no bulb to replace; no straw to hold onto the grime that gets stuck inside…no nothing. Just a few simple components that are easy to use, easy to disassemble, and easy to clean.

The only alternatives that can remotely match this ease of use are the soft-sided bottled filters that use a straw, and you suck the water through the straw while squeezing the bottle to get the water through the filter. It works, but the flow rate is pretty slow, which is agonizing when you’re trying to rehydrate on a hot day. And sometimes those bottles inexplicably use stainless steel, so you can’t squeeze the bottle to increase the flow rate. All you can do is suck. And that really sucks.

Since the Grayl presses the water through the filter all at once, you don’t have to deal with any of that, so drinking from it is just as easy as drinking a glass of water. It does take some extra effort ahead of time, since you have to press the water through the filter (it’s good to press against a low coffee table, or kneel down and press it against the ground, so you can use your body weight to make it easier), but the 15-30 seconds it takes to press the Travel filter means no sucking and squeezing later, and the Tap and Trail filters go even faster.

You know what else is great? You can pour the clean water into another container.

Grayl Ultralight pouring
So simple…

That’s generally out of the question for the suck/squeeze bottled filters, which means you can share a single Grayl between multiple people, or use it to fill extra bottles for backup. You could do the same thing with pump/hose filters, but the Grayl Ultralight is lighter, simpler, and has a lower upfront cost.

Minor improvements to this version

Compared to the original stainless steel Grayl Legend, the Ultralight has a couple design changes that fix minor usage issues.

1) Straighter

Notice how the stainless steel version can tilt a bit as you close it, whereas the Ultralight stands up straighter:

Grayl tilting
Admittedly, it’s pretty subtle.

With the stainless version, it’s possible for the lower cup to “bite” into that blueish rubbery band, whereas the Ultralight won’t do that. This is partly due to the extra thickness of the plastic, which keeps it much straighter, plus that 90 degree angle where the outer cup meets the seal. There’s nothing to get in the way.

2) Grippier

That rubbery band is also bigger than before, jutting outward just a bit, rather than being recessed slightly, providing a non-slip grip for your thumb and forefinger. The plastic used in the bottle is also a bit textured, so it’s fairly grippy as well, and the textured surface also cuts down on condensation building up and dripping down the sides if the water inside is too cold.

3) Clippier

Lastly, the new lid can hook into a carabiner:

Grayl Ultralight carabiner attachment
Yes, yes, S-shaped carabiners are cooler, but this is what I had.

This is great for clipping it onto the side of a backpack, usually through the compression strap that tends to be over there, or you could loop a shoulder strap through it and carry it by itself, without needing a daypack.

There’s some discussion of maybe designing an alternate cap with a smaller drink spout, which would make it easier to drink while moving on a shaky bus, or riding a bike. I’m looking forward to seeing something like that at some point, but in the meantime, this is quite simple, lightweight, and carabiner-compatible. It also doesn’t take that many rotations to open it. You know how you have to rotate certain caps three or four whole times to get them open? This one doesn’t need more than a quick twist.

Minor usage tips

  • You’ll want to use your body weight when you’re pressing the filter, especially when using the top-of-the-line Travel filter, which has more resistance than the other filter options. As mentioned, find a low coffee table, or a sturdy chair, or just kneel down and press against the ground, rather than using a high countertop.
  • When pressing the filter, or removing the inner cup from the outer cup to fill it up again, open the lid just a bit. This will let the air escape, so you’re not fighting against a vacuum.
  • When you’re pressing the filter, leave the cap on, but open slightly, so you don’t get your hands on the rim where your lips will go.
  • If you take it on a plane, the air inside the bottle will be under a higher pressure than the air inside the cabin, which can force the seal open. So when you get up into the air, just open the lid, and close it again. That’ll equalize the pressure. You can also empty it out before you fly, so there’s no water to leak out (remove the inner cup from the outer cup and empty both, as there’ll be a bit of moisture in the pre-filter area as well), or, alternatively, you can fill it up all the way, so there’s little or no air inside that can change pressure. Fun physics fact: Liquids don’t change much in response to pressure.
  • When you’re removing the inner cup from the outer cup, twist it a bit, instead of just pulling it straight out. It’ll come out more easier.

Final thoughts!

As you can tell, I’m quite happy with this. The one and only potential problem with the original design was the weight, which has been completely solved. The filtration performance is up there with the best filters you can possibly find, and even beats several of the more famous options out there, often by a lot. Better yet, this fits into a bottle you can take with you anywhere, with no dangly hoses, no pumping, no sucking, no squeezing, no lightbulb shining, no battery switching, no waiting half an hour for iodine tablets to work, and no iodine flavor when you’re done waiting. Just fill, press, and drink.

In the last few years, certain worthy competitors have halted operations, while several others have been shown to have wildly unrealistic marketing claims, and some continue to be inexplicably famous despite their insufficient performance. And, in the same time period, we’ve had lead poisoning scares, E. Coli outbreaks, and other nuisances that most filters were not designed to solve. They even treated the E. Coli outbreak with chlorine, and then the water tasted like chlorine. Great!

Grayl is one of the inexplicably few options that can handle all these contaminants (and pesky viruses), with removal rates as good as anything you’ll find, combined with unrivaled ease of use and portability. And by swapping out the filters according to what level of filtration you need, you can use it at home, in the woods, or in remote villages in developing nations. In other words: Anywhere.

Now that there’s a lightweight version at half the weight (and a lower cost), there’s just no down side. This is coming with me wherever I go.

Head over to check it out.

As mentioned, they’ve provided me with a test sample, and, years after this review, made me a revenue-sharing offer as well. But I liked it long before then anyway.

About SnarkyNomad

Eytan is a pretentious English major whose rant-laden sarcastic tirades occasionally include budget travel tips and other international nonsense. You can follow his every narcissistic word on Facebook, Twitter, or Google+.

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56 Comments on “The Grayl Ultralight is here!”

    1. Oddly enough, yes. It looks a little weird though, because the steel is a lot thinner than the plastic, so instead of lining up correctly, the top part (the inner cup) will kind of stick out wider than the outer cup. Vice versa works, too, although in that case the plastic outer cup will be wider than the stainless steel inner cup, kind of like what the Grayl Quest looks like now.

  1. Could you compare the pressure to use the travel filter with the pressure to make coffee with an aeropress? I only ask because you mentioned them in that post for caffeine and travel addicts like me.

    1. Actually that’s a good way to compare, although I gave away my Aeropress when I was trying to quit coffee (still sad about it…), so I can’t do it side by side, though as I recall, the Aeropress was a bit easier than pressing the Travel filter (soon to be renamed the Purifier). I never really felt the need to put the Aeropress onto a shorter table to do it, although I did lean over it, resting my head on top of my hands to get more weight on it. The Tap filter is a lot easier, though. Easier than an Aeropress, I would say.

  2. How secure is the cap? I tend to throw everything into a backpack (single large compartment), so I’m a little nervous about the quick twist cap.

    1. The silicone band is what keeps it tight, so it’s going to be as tight as any other cap. It just has fewer plastic threads, which don’t do anything to create a seal, so that’s why I like how there aren’t so many of them. The extra twists on other bottles don’t accomplish anything, since it’s just the silicone part that matters. It’s super tight.

  3. The kickstarter page for the Ultralight claims “Fast Flow Rate: 15 seconds per 16 oz (2 liters/minute)”… However, the Grayl website states “Press time: 30 seconds per 16 oz (473 ml)
    Flow rate: 1 liter/minute” for the Quest with Travel Filter. Has the travel filter been redesigned? Reducing the filtration time by half is huge if the kickstarter page is accurate.

    I bought the Quest with Travel filter two months ago for some 2016 trips — Mexico, Peru, Spain, London, Thailand, and other areas in Southeast Asia. Do you think that this update is worth replacing the Quest I just bought?

    1. So the filter is the same, but they recommend a different technique to press the filter; kneeling down and pressing against the ground, so you can get your body weight over it. That speeds things up quite a bit. Low tables, like coffee tables, instead of high countertops, will help in the same way. They probably haven’t updated the numbers for the Tap/Trail/Travel filters on the site because they’re going to revamp the options anyway, by shipping every Grayl with the Travel filter. People kept asking which filter does what, and everyone loves the Travel filter anyway, so they’re just going to give everyone the best one and nobody has to worry about which is which.

      I really, really like the weight reduction on this thing, and for me, it’s a big enough deal that I’m happy to make the switch. But if you’re happy with the Quest, the weight difference isn’t gigantic…I’d say it depends how often you plan on using it, how much hiking you’ll do, and so on. If you feel the Quest is still pretty heavy, then go for it.

      1. Ah, that’s where the confusion came from. Thanks for the clarification.

        I really hope they don’t take away the different filter options because the Tap and Trail are *much* less expensive than the Travel filter. If the Travel filter is the only one available I will probably stop using the Grayl for every day use and only use it when traveling.

        1. So from the Kickstarter updates page, the plan is to eliminate the Trail filter, but continue offering the Tap and Travel filters, but at reduced costs. They’re saying they might bring the Travel filter all the way down to $25. That number might change, but that’s the tentative plan. I think that since so many people were asking which filter is which, they can save a lot of time and customer service emailing by just shipping every bottle with the best filter, instead of offering so many different options. That’s the one people like the most anyway, and then they don’t have to worry about it. But they’re still going to offer the Tap filter as a separate item on their website, so you can use it on tap water at home, which is nice, since that’s what most people would be doing on a daily basis. So instead of Tap, Trail, and Travel, it’s basically going to be Tap and Everywhere Else.

  4. This looks like very nice piece for backpackers and I like the lid much more than the Legend. My only gripe about the legend is that it’s really hard to drink from the cap and it has leaked if not seated properly.

    Do you know if I can buy just the inner sleeve? As I do motocamping in the backwoods I much prefer the tougher metal. A wipeout ending with a cracked water filter could be as bad as a cracked bone!

    Thanks for doing this site. I know you get something out of it… but so do I :)
    Your review led me to the Grayl and about 2 years in I still feel it to be one of my best pieces of equipment.

    1. I don’t think you can buy just the inner sleeve, but the inner plastic sleeve does in fact fit into the metal outer sleeve of the Legend, oddly enough…although it looks a little weird, as the plastic Grayl is wider overall than the stainless steel one.

      1. Thanks! I bet down the road they will sell replacement parts. At $60 I cant justify the purchase just to get the lid :)

        Mighty buy one for the wife though and swap them when she isn’t looking!

  5. One quick question, I hope you can answer-

    How strong is Ultralight? Less than Legend? I just am wondering- I usually throw it in a backpack with other stuffs including metal objects. Of course, it would crash everything if it is dropped.

    1. The plastic is actually pretty thick, so I actually wouldn’t get too worried about it. The metal version is obviously going to be stronger, and it’s also thick enough that it’s difficult to dent it (because it needs the walls to be straight, to form the seal, so they’re thick and strong). But I think you’ll probably be fine.

  6. I’m really looking forward to the Ultralight as my main complaint about the original version (which I received in a giveaway hosted by you) is that it’s too heavy. For a while, I was filtering my water with the Grayl then transferring it to a lighter plastic bottle. As for how much pressure it takes to push down on the unit, my troop of 10 year old Girl Scouts could all do it without any problem at all.

    P.S. I’m hoping that lightning will strike twice by you hosting another giveaway for the Ultralight and me winning it.

    1. Congratulations on winning the first time! Happy to hear you liked it too, and I can definitely say that the new one resolves the only potential problem of the original (although I think I’ll take the stainless steel one if I ever had to go on a fancy business trip with board meetings or something like that). No news as far as giveaways go, and I’m planning to be out of town pretty soon, which is part of the reason I try to avoid them. It takes some coordination that I can’t always manage if I’m in the middle of nowhere with no internet connection. But it uses the same exact filters as the one you’ve already got, so if you have spare filters, you won’t have to buy new ones for a little while.

  7. What about cleaning? We currently take stainless steel ones which are easy enough to clean with some vinegar and bottled water, but take a while… and bottled water defeats the purpose

    1. If you can scrub with clean water, that’s fine; if you only have not-quite-clean tap water, then clean it with tap water, and then rub it all over with alcohol. I usually just clean the mouthpiece with an alcohol swab every so often, and I wait until a trip is over and I get back home to clean out the whole thing. If a trip is only a few weeks or even a few months, I don’t worry too much about bacterial buildup (especially since the filter is drawing them right out of the water).

  8. My family has a pathological water Boil rule ( Grampa’s first wife died from tainted water in the 30’s, in Asia)
    I’ve had the original since 2012, and have used it from airport bathroom sinks to jungle rivers. I LOVE THIS THING!!
    But…. Do I need to get a whole new rig, or do the newer filters fit the original?

    1. The filters are all the same, so they’re interchangeable between the stainless steel and plastic versions.

    1. They each last 150 liters, so if you drink a liter a day, that’s 150 days. But it’s usually hot in Central and South America, so you might be drinking 2 or 3 liters a day or more, so plan on them lasting about 2 months each at the most. But you also might buy drinks like juice, soda, coffee, and others along the way, so that’ll help them last longer.

  9. I’m glad to see Grayl make the filters lighter and cheaper. Makes it much easier to recommend to friends who might be on a tighter budget. I got a Quest some months ago using one of REI’s periodic coupon codes. Also several spare cartridges of the earlier type, where the colors and nomenclature were more confusing, on clearance from Backcountry. But not everyone can hunt down bargains like that. Especially on short notice. Now I can just say “Grayl ultralight!” and call it done.

    I carry the Quest in my standard overnight bag (just add gear for camping or clothes for travel), but have never used it because I don’t want to start the clock ticking on the cartridge’s life span. Found myself wishing for it in Florida last week though. I’d left it at home due to weight, brought along some collapsible water bottles instead that ended up leaking, and quickly got annoyed with how funky the water tastes in the Magic Kingdom. My family got a little cranky from dehydration after refusing to drink that water. Ended up using lots of lemonade flavor packets. Gotta wonder if a Grayl would’ve helped.

    Two of my sons are Boy/Cub Scouts. I gave each of them a Sawyer mini squeeze filter. About $20 and rated for huge amounts of water, but trickier to use and does nothing for viruses or chemical pollutants. But it’s cheap and extremely small so the boys are more likely to actually have it on hand when wandering off the trail at camp. Thought of sending them with Grayls, but even the Quest model is too heavy by their standards. Scout policy is they must carry around the “essentials” at all times when camping — including rain gear and extra clothes. Every extra gram counts with that kind of base load. Grayl’s ultralight model with the cheaper orange filter would be better for that usage scenario than previous models.

    Good to know Grayl has been making improvements to the product line.

  10. If any of the Grayl people are reading this: Grayl Ultralights ought to be in the official Boy Scout stores. Way better than the other filters they sell now, and much better visibility to potential customers. Worth looking into.

  11. Hi,
    Nice website. I will travel for a year or more by bike through South America, Central America and South East Asia and the Grayl Ultralight looks great, but has rather a small capacity. I am looking for a similar product, able to remove viruses, but from 1 l to 2 l rather than 0.5 l. Would you know whether Grayl or another company offers such product?
    Thank you.

    1. I don’t know of any bottles with a significantly larger capacity. I think the best option is just to bring two bottles; a Grayl, and a second, regular water bottle. Maybe one of those collapsible ones, so you can store it without taking up space. That way you can store a lot of water, filter it when necessary, and carry one bottle on each side of the backpack, to keep the weight centered.

  12. Hello,
    I don’t see how you can recommend the Grayl over the Water to Go filter bottle, half the price, lighter and mush easier to use ?
    Am I missing something ?


    Lee Ho.

    1. I’m quite sure the Grayl and Water to Go use the same filter material, but the Grayl uses twice as much of it, so its removal rates are higher. I wouldn’t get TOO worried about it, but it’s something to think about (nothing gets 100% removal, so it’s 99.9%, or 99.999%, or something like that). Also, part of the Grayl’s design was intended to provide the advantage of not having to use a straw, which often requires a lot of strong inhaling to use; plus, you can pour it out for a friend. They both work, but people out there might just have a personal preference for the straw or non-straw design. Personally, I just like the look and feel of the Grayl, and I think that if you take its higher removal rate into consideration, since it uses more of that filter material, that’s why it’s more expensive.

  13. Hello,
    I’m going to South America (Argentina, Chile, Bolivia, Peru, Ecuador) for 6 month. Main goal is to avoid buying bottled water. After reading a lot of reviews the grayl seems to be the best option (filtering viruses, option to pour out water without sucking). Would you recommend it for longterm use and for a girl? One more question: Is it possible to use the bottle without the inner part? For example when I’m back home and want to fill up with clean tap water?
    Theanks for your help!

    1. You can’t use the bottle without the inner part, but you can just fill up the top by removing the cap, if you know you have clean water and you’re not worried about it. They do have another filter cartridge just for tap water though, so if you’re somewhere that has lead flavor in the pipes, then that’s what you’d want. It’s very durable, and I expect it’ll last a long time. The silicone bands that form the seal are installed directly on the filter cartridge, so they get replaced every time you get a new filter, so there’s really nothing that can wear out over time.

      The only alternative you might want to think about is something with a smaller drink spout, like a straw, if you’re riding a bike, or something like that, but if you prefer the drink-from-a-glass style of the Grayl, then I don’t see a downside.

      1. I think this article and your responses are somewhat dishonest and perhaps financially biased towards Grayl for some reason. You linked to an article that pointed out many filter companies make grand claims about their filters without any certification. Yet, for some reason, you then go on to claim that the Grayl is the end all solution without any justification. Why? Because you say so? Because Grayl says so? Where is Grayl’s certification? Why should we believe you or them? This is serious business because you are talking about people getting very sick and even potentially dying due to false claims and a lack of certification and regulation. Where is Grayl’s certification? The only filter I could find that had EPA certification was the AguaMira Frontier Pro. What about Grayl? There is no mention of certification by you or Grayl.

  14. Sorry, it’s the Frontier Max Filtration System that has the EPA certification. I have not found any other lightweight convenient filter with EPA certification.

  15. This is another one that has some certification:

    On another article of yours a poster mentioned it, but you failed to respond and ignored it. You should follow up these articles with information about which ones have some sort of certification and which ones (like the Grayl) make baseless self-efficacy claims. You owe this to your readers both ethically and morally. If you want to favor some pair of travel pants or whatever bloody socks who cares, but water filtration is a serious matter that you should be thorough, clear and honest about.

      1. Thank you. Sorry, I should have been more diplomatic. Sorry about that and thank you for your kind response and effort to look into it. Much appreciated.

        1. No problem. This gets both contentious and detailed, and I wanted to get the testing info to clear up any questions. I was looking at the lab tests they’ve run, but wanted to make sure it’s fine to share publicly, in case there were any concerns with competitors and things like that.

    1. Thanks for the question, Joe. At GRAYL, we take quality control and testing very seriously because, as you mentioned, water filtration and purification is a very serious matter.

      GRAYL tests every single batch of units we produce in 2 ways. First, we pull random units directly off the production line and submit them to rigorous ‘physical testing’, in which we use pressure and water ensure the integrity of our materials and seals.

      Second, we ship 1% of units to in independent lab for testing. We undergo 4 different types of tests. You can see test result for each type in this Dropbox folder –

      At the lab, there are 3 types of tests we run.

      1. Broad-Spectrum Pathogen Testing – Every batch receives full pathogen testing to determine pathogen removal rates. See Attachment: Grayl RT, MS2 and Cyst study BCS 1611102-112 11.09.2016

      2. Chemical & Heavy Metal Testing – Periodically, GRAYL performs a series of challenges against a wide array of chemical and industrial impurities. The results of these test can be found in to documents. The first: J58944-1 UDS Level 2 Report Final Report is the official lab report, it is difficult to read without training. We summarized its findings in this document: Grayl Chemical and Heavy Metal Test – Share

      3. Specialty Testing: We are interested in how GRAYL’s Purifier Technology performs in special situations. For instance, we recently ran a series of tests in turbid water (aka, silty water, muddy water) to analyze performance and lifespan in non-clear water. See results here: GRAYL TurbidWater Test – Dec 2015

      Very happy to answer additional questions on our testing regime. Please contact us at info (at) thegrayl (dot) com.

      Travis – GRAYL Co-Founder

  16. I think I’ve concluded that if one wants to be totally safe, you have to use the filtering in combination with water purification tablets or boiling. The filters can get a lot out, but there is no guarantee, so following up with tablets or boiling is prudent. These are the recommendations of the CDC. The Grayl is exactly the kind of thing I am looking for as well, but without third party certification, it is too risky considering the potential consequences. They will probably say that it does what they say, but no matter what the water filter industry seems to be weak when it comes to reliable certification. I may end up getting the Grayl combined with tablets since it is seems to be the most elegant, well priced option out there. There are, however, plenty of DIYs as wekk that could also get the job done in combination with tablets.

    1. That’s a pretty good homemade filter, Joe!

      You are correct that third-party certification of ‘portable filters/purifiers’ does not currently exist (as it does for fridge filters, for instance). I understand there is a group working w/ NSF to create such a certification.

      One challenge to this certi is that, unlike fridge or under-sink filters, there is no standard form factor. The regulations would have to cover GRAYL’s unique Fill. Press. Drink, plus suck/squeeze bottles, suck straws, gravity filters, camping pumps, etc.

      In the meantime, I think it’s legitimate to demand a higher level of transparency about testing from manufacturers like GRAYL. It’s definitely something that GRAYL is working on.

      Again, thanks for your interest.

      1. Hi Travis, thank you for your attention and transparency. There are a bunch of home made DIY filters out there its seems.

        However, there are potential contamination issues with them. Commercial filters like the Grayl probably are a better, safer and more convenient route to take. The Grayl certainly has its benefits and is a valuable and necessary part of the purification process. Of course I am sure you know way more about it than I do as I have only researched it recently. After all the reading I did, I realized that most of the filters, and not just the Grayl, have their limitations and that in the end a combination of filtration and chemical treatment with tablets/drops or boiling is the safest route. The Grayl is just as good if not better (due to its convenient process and design) as any of the other filters out there. There are only a few others that have some EPA certification but even those seem to be potentially faulty due to failure, user error or age. Not surprisingly, they are much more expensive and cumbersome to use, so something like the Grayl certainly has its place for many users. Best of luck to you and I would also just like to add that Snarky Nomad has a terrific site here with a lot of excellent information that I find very useful.

  17. Eytan, I’ve been coming to your sight for quite some time ever since I was about to leave the country for the first time to study abroad. Now, as I head to Nicaragua for 3 months, I have a carry on weweughing 20.5 pounds and I couldn’t be happier. You’ve been such a great ultralight travel resource, and I just wanted to sincerely thank you. All the best, and thanks again!

    1. 20.5 pounds? I’m not sure that’s quite right…sounds like a typo. Either way, I’m always happy to hear that I’m being useful to someone.

  18. I live in Australia, and have several chronic illnesses, one of which gives me many intolerances, sensitivities and digestion issues.

    Tap water in general makes me sick. But even some bottled waters do. I doubt it’s bacteria or viruses causing these reactions: it’s more likely to be something the water has been treated with (eg chlorine, fluoride etc).

    Does the GRAYL remove those kinds of things too, or only particles and germs?

    1. Yes, it removes a lot of chemicals, including chlorine and iodine. My understanding is that fluoride removal is far more difficult, so most filters don’t make claims about removing fluoride, even though they might remove a little bit of it, but the carbon filtration step removes a lot of these, because it’s absorbent, so chemicals get stuck inside.

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