The world's most in-depth and scientific reviews of outdoor gear

Grayl Geopress Review

The best water bottle purification system built for traveling abroad.
Top Pick Award
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Price:  $90 List | $89.95 at REI
Compare prices at 3 resellers
Pros:  Super easy to use, fast filtration, durable design, amazing water quality
Cons:  Bulky and heavier design
Manufacturer:   Grayl
By Amber King ⋅ Senior Review Editor  ⋅  Oct 16, 2019
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SCORE


RANKED
#4 of 20
  • Water Quality - 20% 10
  • Durability & Maintenance - 20% 5
  • Treatment Time - 15% 9
  • Weight & Packability - 15% 2
  • Ease of Set-Up - 15% 9
  • Ease of Filtration - 15% 8

Our Verdict

The Grayl GEOPRESS is a water bottle with a built-in purification system. It stands out for its ability to take water polluted with heavy metals, microplastics, viruses, and microorganisms, and scrubbing it clean. What's more, it is easy to use. No need to pump, squeeze, or wait. Simply collect the water, press it through the system, and start drinking. The bottle itself is quite large, and while it can be used for backpacking, it's not meant for ultralight adventures. It can easily be clipped to a backpack or stored in a larger water bottle sleeve while on the go. If you are traveling or planning to live in a country with questionable water flowing on tap or heavy pollutants in the streams and rivers, this is our top recommendation.


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Grayl Geopress
Awards Top Pick Award Editors' Choice Award Top Pick Award Editors' Choice Award Best Buy Award 
Price $89.95 at REI
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$29.96 at Backcountry
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Overall Score Sort Icon
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Pros Super easy to use, fast filtration, durable design, amazing water qualityFast, easy, hands-free filtration, large volume, storageEasy to use, fast flow rate, collapsible, lightweightLightweight, adaptable, easy to use, lifetime guaranteeLightweight, great price, durable design, fast flow, high volume filtration
Cons Bulky and heavier designA little expensive, can't gather from shallow sources, clogs with heavy sedimentLacks durability and reliabilityNot great for group use, better if you replace the bagsDoesn't filter out viruses, no additional storage reservoir
Bottom Line The best water bottle purification system built for traveling abroad.A fast and easy to use gravity filter perfect for dynamic duos, solo travelers, and groups.Our favorite lightweight on-the-go filtration system.Simple filtration that is light and reliable with a lifetime guarantee.The best value gravity filter on the market.
Rating Categories Grayl Geopress Platypus GravityWorks Katadyn BeFree Sawyer Squeeze Katadyn Gravity Camp 6L
Water Quality (20%)
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Treatment Time (15%)
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Weight & Packability (15%)
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Ease Of Set Up (15%)
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Ease Of Filtration (15%)
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Specs Grayl Geopress Platypus... Katadyn BeFree Sawyer Squeeze Katadyn Gravity...
Type of Filter Press-action Gravity filter Squeeze & on-the-go Squeeze, in-line, on-the-go Gravity filter
Time to Treat One Liter (Timed Test) 18 seconds 52 seconds immediate 40 seconds 64 seconds
Measured Weight (entire kit -- oz) 19.4 oz 11.5 oz 2.1 oz 5.7 oz 11.7 oz
Storage Capacity 24 oz 4L 0.6 L Varies 6L
Removes Bacteria? Yes Yes Yes Yes Yes
Removes Protozoa? (Cryptosporidium, Giardia Yes Yes Yes Yes Yes
Removes Viruses'? Yes No No No No
Removes Chemicals? Yes No No No No
Removes Heavy Metals? Yes No No No No
Removes Particulates (sediment, microplastics)? Yes Yes Yes Yes Yes
Filter Pore Size N/A 0.2 microns 0.1 micron 0.1 micron 0.2 microns
Advertised Flow Rate 5/min 1.75L/min 2.11 liters per min 1.7L/min 2 L/min
Dimensions 10.4 x 5.6 x 3.4 in 9.4 x 3 in 9.05 in x 2.73 in 11 x 6 10 x 6 x 2.4 in
Filter Media or Active Ingredient Ceramic, Activated Carbon Hollow fiber Hollow Fiber Hollow Fiber Pleated glassfiber
# of liters/galloons per lifetime 250L 1,500 liters/396 gallons 1000 liters/264 gallons 378,541 liters/100,000 gallons 1,500 liters/396 gallons
Water Bottle Adapter No No Yes No No

Our Analysis and Test Results

The GEOPRESS impresses us with its ability to turn the most polluted sources into potable water. Filtering 750 mL of water in under 20 seconds, it stands out as one of the fastest and easiest water purification systems out there. It is built as a bottle with a purification system built-in. While it's not our first choice as a backpacking purifier because of its heavier weight and bulkier design, it is our favorite for traveling abroad.

Performance Comparison


Fill up in the most disgusting places and receive clean water! This top pick allows you to simply scoop  press  and drink. Wherever you go!
Fill up in the most disgusting places and receive clean water! This top pick allows you to simply scoop, press, and drink. Wherever you go!

Water Quality


Grayl claims that this water purifier is fit to clean water from places all over the world. Unlike regular filtration systems, it goes beyond removing just bacteria, protozoa, and particulates. It can also remove heavy metals like lead, cadmium, and arsenic in addition to viruses and microplastics. Essentially, this covers most water pollutants that you'd find in some of the most questionable sources in all the world. The purification cartridges supersede EPA standards, offering reliable water purification for anywhere in the world. So, with these claims, we decided to put the GEOPRESS to the test.


The water basin that surrounds the town of Ouray in Colorado is severely polluted by heavy metals, including arsenic and cadmium. The waters flow yellow, with no signs of life as the water is acidified from both natural and human-made influences. When we saw this, we thought, what a better place to test a purifier that claims it can clean water from anywhere in the world?!

Here we see the difference in water quality. On the left is cadmium  arsenic  and iron oxide water source. To the right  we get clean  drinkable water. This filter has the capacity to cleanse the water of almost everything.
Here we see the difference in water quality. On the left is cadmium, arsenic, and iron oxide water source. To the right, we get clean, drinkable water. This filter has the capacity to cleanse the water of almost everything.

Scooping up the water, it reflected a disgusting hue of yellow, indicating that the water in our bottle was indeed polluted with heavy metals. We thought that this color would stick around, and the loss of the color would be a great indicator that the cartridge could suck up the metals with its ion exchange and activated charcoal technology.

A look at the color difference after filtration.
A look at the color difference after filtration.

As we started to press, we saw that the once yellow water was being pumped out as clear. To our surprise, when we finished the purification process, the water smelled better, the color was gone, and we drank some. It tasted clear and delicious. While this river is not our first choice as a great source for water, it sure did prove a task for this system to filter. We are happy to report that water quality is amazing and unmatched when it comes to this system. We'd recommend it just for what Grayl advertises. This makes it a Top Pick for travel and the best option out there when it comes to heavy pollution.

Durability and Maintenance


The bottle is manufactured from a heavy and durable plastic material that stood up to our basic durability tests. We toted it around on the outside of a backpack while traveling in Canada, threw it inside our backpack, and even dropped it, completely full, from different heights. We tried to break it, but it, alas, withstood our physical tests.


Reliability is of enormous importance, especially when traveling in places where questionable water is flowing through the taps, and you want to ensure your water is of good quality. From our preliminary tests, we think that the infrastructure of this bottle is pretty sound. The exterior bottle has a thicker plastic, while the internal container is made of thinner plastic. Our only worry would be this plastic breaking under extenuating circumstances. Another potential concern is the seal of the bottle. The integrity of the design is hinged on that seam remaining intact. While we didn't see any signs of this being an issue, and we haven't read about that online either, it's something to think about.

A look at the seal of the Grayl Geopress that seems pretty bomber.
A look at the seal of the Grayl Geopress that seems pretty bomber.

Maintenance is also simple with this system. The cartridge is deemed to last either 350 presses (or 65 gallons/250 L). If the press time significantly decreases, it's time to replace it. Another big qualm is that there is no cleaning option. They simply say to take it off and rinse it off. In turbid water, be sure to prefilter.

Testing the durability of the outer plastic with a full water bottle landing on its side  top  and bottom. In all tests  the bottle didn't break or fail.
Testing the durability of the outer plastic with a full water bottle landing on its side, top, and bottom. In all tests, the bottle didn't break or fail.

If it fails for some reason, it must be replaced. The replacement of a filtration cartridge is about $25. If you're somebody who lives in a foreign country or filters a lot of water, this replacement cost could add up over time. However, if you're simply traveling, it's probably not an issue.

Treatment Time


Grayl claims a bottle treatment time of about 8 seconds. We performed three different tests, pushing down on the bottle with steady force and we found treatment (with tap water) to be around 18 seconds on average. While this isn't as fast as the claimed time, it's still super fast to get water into a bottle that can be drunk easily after filtration.


When treating water in murkier or high sediment sources, this treatment time decreased significantly. Especially turbid water sources exist in many areas of the world. While this isn't a deal-breaker, it's good to know that you'll have to put more muscle into filtration with these sources.

A look at the filtration cartridge  that relative to other purification sources  doesn't last very long. If you plan on using this consistently  be ready to shell out some extra cash to maintain water quality.
A look at the filtration cartridge, that relative to other purification sources, doesn't last very long. If you plan on using this consistently, be ready to shell out some extra cash to maintain water quality.

Weight and Packability


When we first got the package, we were surprised at the size of this bottle. It's bigger than a 1-liter Nalgene bottle and weighs about 19.4 ounces, which is pretty big. At first glance, we said, "We'd never use this for backpacking, it is way too big!". However, when looking at the online reviews, we learned that many people are doing just that. When we started using it, we also understood why some people dealt with a bulkier and heavier bottle as a trade-off for convenience and ease of use.


That said, this is definitely not our first choice for backpacking adventures; however, its use isn't completely negated in this setting. Most people need to carry a water bottle while backpacking anyway, and while this is larger and heavier than the typical bottle, it offers both a filter and a bottle in one system. In addition to backpacking, it has better use while traveling. It has a nice carabiner clip so it can either be clipped onto a backpack (if you don't mind a bottle swinging around) or it can fit into a larger and more forgiving water bottle sleeve. Since it is watertight (it doesn't leak), you can also put it inside a backpack, upside down or on its side. For those that want an ultralight setup and are limited in space, we don't recommend this bottle.

A look at the relative size of this water purifier next to a seltzer water can  which is 750 mL.
A look at the relative size of this water purifier next to a seltzer water can, which is 750 mL.

Overall, this bottle is heavy and isn't very packable, earning it a lower score in this category. It's not our top choice for backpacking, but if you don't mind carrying the extra weight, it sure does make water purification easy on-trail. We recommend it for use while living or traveling in countries where water purification is necessary since it is so easy to use.

The relative weight in grams  which is about 19.4 oz. This is much larger and heavier in comparison to other bottle filtration units  but lighter than some of the purification hand pumps out there.
The relative weight in grams, which is about 19.4 oz. This is much larger and heavier in comparison to other bottle filtration units, but lighter than some of the purification hand pumps out there.

Ease of Setup


This is an easy to use water purification system. There are no complex parts or pieces, and no steps that you need to memorize.


Simply, find a water source. Turn on a spigot, a tap, find a puddle, river, or lake. The bottle has a smaller bottle with the purification cartridge nested inside the larger outer bottle. Pull this bottle out. This does require a bit of muscle because of the seals, but rotating the cylinders in opposite directions helps with this process.

A look at water collection that's relatively easy in deeper puddles or running water. Just be sure you can access the water source.
A look at water collection that's relatively easy in deeper puddles or running water. Just be sure you can access the water source.

Next, fill up the outer bottle. Shallow puddles and tall banks are the hardest water sources to gather from. You must be able to reach your water source. Collect your water. Then, find a surface that you can press the filtration unit down on. Ideally, this is an even surface.

Getting ready to push the water through the filtration unit at this remote lake in Ontario.
Getting ready to push the water through the filtration unit at this remote lake in Ontario.

If you can't find one, put your backpack down, and use that as a flatter surface. Next, reinsert the interior bottle insider the outer bottle. Put the lid on, open the vent (by rotating the top of the drinking spout), and get ready to press. Overall, the set-up is pretty simple.

Water that is full of particulates is really hard to press with this system. If you are collected from a source full of silt, sand, or clay particles, allow the water to settle in a different container, then decant the clean water off the top to help with this process.

Ease of Filtration


Other Grayl products have been much harder to press than the GEOPRESS, but we are happy with how easy this system is to use in most cases. As mentioned, turbid water is harder to press through the purifier.


The large bottle has an increased surface area that allows water to flow easily through the purification cartridge. To filter the water, simply place the meat of your palms on the rubberized press grips along the top of the cap. Using the weight of your body (to avoid pressing with your arms) with either straight or partially bent arms, press down on the system. When the internal bottle has been completely pushed down you're done! Now it's time to drink 750 mL of water…in just 18 seconds (in our tests).

Pushing the water through the filter requires a little bit of patience  but it filters one liter of water quickly and efficiently.
Pushing the water through the filter requires a little bit of patience, but it filters one liter of water quickly and efficiently.

Value


This top pick costs enough that you want to be sure it fits your needs (for most folks, international travel) before buying. It offers versatility and reliable water quality anywhere you might go. It's important to consider that the cartridge life is much lower than many other filtration systems, so be prepared to drop another $25 when it comes time to replace the cartridge (after ~350 uses), which is much shorter than the average filter life. Aside from that, we deem this a product of great value and worth every penny.

Drinking from questionable sources? This is a great purification system to keep you healthy.
Drinking from questionable sources? This is a great purification system to keep you healthy.

Conclusion


Is travel to far off lands with questionable water sources on your horizon? The Grayl GEOPRESS provides a purification solution that is unmatched by any product on the market. While heavier and bulker in design, it's quick and easy use makes 750 mL of water in under 20 seconds. It's fit to be used anywhere in the world, removing all contaminants including heavy metals, microplastics, chemicals, and biotic organisms. If you're going to choose a filter that you can trust all over the world, this is our top recommendation.


Amber King