Gray Geopress water filter

Grayl Water Bottle & Purifier Review

Imagine always being a sip away from fresh, purified water, whether you’re scaling rugged mountains, navigating deserts, or exploring the vibrant streets of a foreign city. The Grayl Geopress Water Bottle has been my trusty companion on adventures vast and varied – from serene hikes and exhilarating kayaking journeys to the simple joy of a day out exploring. Its promise is simple yet profound: access to clean, safe, and delicious water anywhere your wanderlust takes you.

This isn’t just any water bottle; it’s a call to adventure. Designed for the explorers at heart, the Grayl Geopress is about making every drop of water along your journey safe and satisfying. While it may not cater exclusively to the ultra-light backpacker, its unparalleled efficiency makes it indispensable for those who follow the water’s path. Remember, your adventure’s nature should guide your gear choices, especially when it comes to staying hydrated.

Grayl Geopress Filtration System

  • Removes waterborne pathogens removes pathogens such as viruses, bacteria, protozoan cysts, pesticides, chemicals, heavy metals, and microplastics.
  • Capacity: 24 oz
  • Weight: 15.9 oz
  • Filtration Rate: 5 liters/minute
  • Cartridge lifespan: 350 cycles / 65 gallons
  • BPA-Free materials: made from polypropylene #5, food-grade silicone, TPE, ABS food-grade plastic

Grayl Replacement Purifier Cartridge

24-ounce filtration in less than 25-30 seconds. If it takes over 30 seconds to push water through, it’s time to replace the filter.

  • Removes: waterborne pathogens (99.99% of viruses, 99.9999% of bacteria, 99.9% of protozoan cysts), including Rotavirus, Hepatitis A, Norovirus, Giardiasis, Cryptosporidium, E. Coli, Cholera, Salmonella, Dysentery, and more
  • Filters: particulates (i.e. silt, microplastics, etc.); activated carbon effectively adsorbs chemicals, pesticides, heavy metals, flavors, and odors
  • BPA Free

The filter has a 10-year unused shelf life. I recommend changing the filter between long non periods of use.

What does the water taste like?

After pushing a few gallons of water through our Grayl Geopress water bottle – from crisp clear mountain lakes to streams and large lakes – I’ve come to realize it does taste earthy, but not bad. The taste can absolutely reflect where you are filtering from. A crisp mountain stream of snowmelt will taste like some of the best water you may ever find, yet a sandy bottom stream like the stream we took photos with to share the process will taste a bit earthy.

I’ve used Grayl filtered water for drinking, cooking, cleaning, and filling up our hiking and CamelBak water bladders.

How does the Geopress Water Filter work?

grayl geopress water filtration system

Step 1- Locate drinking water

It’s a golden rule of mine that I try and get all my drinking water from bodies of water that are moving if possible. If I find a pond small lake, I’ll try and walk around to find any source of incoming water as well. Large freshwater lakes have enough movement, currents, and flow to help alleviate issues with stagnant water.

On my trip to Southern Colorado, we found this beautiful river where I set up to demo the Grayl Geopress.

Step 1 – Separate the purifier from water cup

Everything just unscrews like the photo below. You use the bottom cup to scoop up or fill up with the water you want to filter.

Grayl Geopress Filter cup with mechaical filter being inserted

Step 3 – Fill-up to fill line – about three-fourths the way up

You should see a water line on the inside of the cup. It’s important to not overfill as it makes the process messy and more difficult if you do.

Open Drinking Lid

Be sure to at least loosen or unscrew the top drinking lid part, you need to let the air out or else you will never be able to compress the water through the filter. For demo purposes, I just unscrewed the lid entirely, but to keep the drinking spout clean it just needs about one-half turn open to vent.

grayl geopress lid

Insert inner bottle into water bottle

The filter should settle down to the point where you stopped filling the fill bottle at the waterline.

Grayl Geopress with filter being inserted

Find a solid surface to use as leverage

This isn’t a gravity drip system, this is “put your muscles into it”. I found a nice rock to push down on. I used one hand to grip the orange cup while using another hand to push down on the top.

grayl geopress filter

Push the Bottle all the way in.

Once you have pushed the bottle all way in, you can screw it together. Enjoy your clean drinking water!

grayl geopress filtration cup mechanical filter


Enjoy freshly pressed, err, filtered water 🙂

grayl geopress filter

Grayl Geopress Review

We’ve had our Geopress in use for over two years now, and I’ve only been through three filter cartridges. I’m happy with the purchase and have it on my recommended product list for a few reasons listed below. I’ve found myself using this device increasingly while freshwater Sailing since I can scoop up water on the move and limit how many water bottles we keep on board. I used to finish a long sailing trip a bit parched, but this works great for hydrating on the lake.

Water is life on the trail, it can be hard to carry enough fresh water on you and plan ahead and even if you do plan, you can’t always rely on that the water your drinking – even from a water fountain is clean and free of nasty stuff you don’t want to ingest.

Whether we’re hitting a fountain, scooping up out of a river, or out on a kayak and dipping into the lake, our Grayl has never failed me. I’ve never had an upset stomach, gotten sick, or had any other digestive problems you don’t want to have while on the trail.

What do we like?

Build Quality – The Grayl Geopress is built like a tank. When I’m thirsty, I squeeze it like I mean it and it’s never failed on me yet.

Easy to clean – I wipe down the filtration inner body, wash the drinking lid and outer body with soap and water. No difficult tubing or tiny areas to clean.

Filters are readily available and last for a while. They’re rated for pushing through around 65 gallons of water. If you find it hard to push and filter, it’s time to replace it.

Taste – Like we mentioned above, taste is not a problem. If you know you have put a lot of water through and you’re not enjoying the taste, it’s a sign you need to change the filter.

2024 Update: I’ve had this filter for over five years now and it still works great. I typically replace the filtration media twice a year. Haven’t broken anything, haven’t had any foul taste or contamination issues.

What don’t we like?

Grayl Filter recycling: I get a lot of clean water through mine but would love an effortless way to recycle these. It’s not as bad as coffee coming from wasteful pods if you ask me, but I always try to be as environmentally conscious as I can.

Grayl Filter costs: It’s my hope that a filter recycling/trade-in program can be set up to lower the costs of filters. Life straw for example says its carbon filter does up to 26 gallons but the mechanical filtration does up to 1000 gallons and those filters cost ~$25 each. The Grayl filters run about 30/each while doing more carbon filtration than life straw but far fewer total gallons.

Price is a tad higher than I thought I would spend, but really, since the entire Grayl Filtration system has lasted a year – much longer than other water filtration systems I’ve used where bladders break, tubes break, hanging hooks fail or whatever it may be, the Grayl simplicity of forced filtration and durability has been great.

When I’m tired, thirsty, and out on the trail, I do prefer the press of the Grayl over sucking through a straw, but that’s just me. In comparison to gravity systems, I’m still a fan of on-demand water but I’ll often carry both depending on the outing.

Where to buy Grayl Geopress

Available online, at REI and direct from Grayl.

You can support our blog by purchasing the Grayl GeoPress through Thank you!

GRAYL GeoPress 24 oz Water Purifier Bottle – Filter for Hiking, Camping, Survival, Travel (Visibility Orange)
  • ONEPRESS GLOBAL PROTECTION: Empowers international travelers and outdoor adventurers to make the world’s sketchiest water sources clean to drink….
  • REMOVES ALL PATHOGENS: Viruses, bacteria and protozoa – from any freshwater source on Earth. Filters pesticides, chemicals, heavy metals, and…
  • UNRIVALED EASE & SPEED: Effortlessly purifies 24 oz (710ml) of water in as quick as eight seconds. Requires no setup time, pumps, hoses, sucking,…
  • MAKES WATER TREATMENT EASY: Use your body weight on the SoftPress Comfort Pads to power purification. Drink and share safe, clean water through the…
  • AWARD WINNING ONEPRESS VERSATILITY: No straw, pump or gravity bag can match. Effortlessly fill from any spigot, hotel sink, murky river, taco stand,…
GRAYL GeoPress Replacement Purifier Cartridge (Orange)
  • COMPATIBLE WITH GRAYL GEOPRESS Water Purifier (not included), this cartridge provides OnePress global protection for drinking water from sketchy…
  • REMOVES WATERBORNE PATHOGENS, including viruses, bacteria, and protozoan cysts (e.g. rotavirus, hepatitis A, norovirus, giardiasis, cryptosporidium,…
  • ACTIVATED CARBON effectively adsorbs many chemicals, pesticides, heavy metals, flavors and odors; filter removes microplastics and other particulates
  • INDEPENDENTLY TESTED & LABORATORY CERTIFIED to meet or exceed NSF protocols 42 and 53 for pathogen and chemical removal
  • Cartridge is rated for 350 cycles (65 gal./250L); Unused purifier cartridge has a shelf life of 10 years when stored properly

Affiliate links & Product Images are from Amazon Product Advertising API.

Wrap Up

I love my Grayl. It’s not the only filtration system I have on me, but it fits the bill for many occasions. To get the most value from such a system, it’s best for people who are actively using it. If you just go on a short hike and drink some water from a nearby stream and don’t do it again for a year, it’s not very economical – but then again, there is no portable system that really is cost effective for casual use with consumables that need replacement even without frequent use.

If you enjoy being outdoors, the Grayl system is extremely durable and easy to use. I hope that the filter recycling program comes to fruition, and it would be nice to have amazon subscribe and save discount or something similar from Grayl direct.

Let us know your thoughts below!

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