How long does the filters last?

Grayl states 250 liters or 3 years from the first use - I bought it for my travel to 3rd world countries for 3 weeks. I drink about 4 liters a day, sometimes more when the place i am visiting is hotter than I am used to. After that trip, I did not use the filter for about 2 years - I picked it back up and it filters well enough.

anyone taken this as your only filter for multi-day backpacking? Any tips/ backup req'd? This seems less likely to break or fail than other methods.

Zero moving parts. Burly design. Pretty tough to break. :) However, common sense says, carry a backup. Those little, terrible tasting chemical tables work. So does boiling. Happy trekking.

Can you fill it up with snow?

I don't think this would work very well. The water you want to filter goes into the outer shell, then you push the inner shell, with the filter on the bottom, down through the water so that the water is forced up through the filter and into the inner shell. It seems as if trying to push the filter down through unmelted snow would just compact the snow into a solid mass in the outer shell, i.e., nothing would be forced up through the filter and into the inner shell. You'd need to melt the snow first.

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S**R

This model is quite large for using in side pockets on most backpacks

Great bit of kit excellent filtration

31.08.2025

A**U

Bit tough

Hard to press down. Bit difficult but water is good though. Tested with water strips.

11.02.2026

D**R

Don't buy this if you go walking in areas with peat soil

This product can't be used with tannin rich water - which I only discovered AFTER I bought it. £100 wasted. I've given it 1 star only because I can't give none.

3.07.2023

O**E

Filters and purifies water

It's a really useful piece of equipment and could save your life

24.11.2022

O**Z

Lo compre porque estaria en una expedicion en un cañon por 5 dias, la relacion calidad precio es lo mejor, nos evitamos llevar cargando agua para todos esos dias o esperar encontrar manantiales, con este filtro solo era cuestion de tomar agua del mismo rio y filtrarla, no tuvimos malestares en el estomago, y su resistencia es increible, ya que estuvimos pasando por rapidos y golpeando constantemente el producto y resistio sin problemas, solo algunos raspones normales

2.05.2023

C**L

Worked perfectly on a recent trip to Egypt. Questionable water was never a concern and the taste of the water we filtered through our Grayl was far superior to any commercial bottled water we could buy. Not cheap, but great insurance having clean, safe drinking water on our travels!

16.02.2026

S**T

Leí que mucha gente dice que se cuela el agua al presionarlo … creo que todo radica en hacerlo con cuidado. De cualquier manera siempre hemos de llevar agua lista para tomar y no depender sólo de lo que el bote nos provea.

17.04.2023

P**H

Well made, easy to use. We bought this for travel - not for backpacking (it is pretty heavy). We have been using it for tap water in countries where it is not safe to drink. The design makes it very easy to use and the separation between dirty water and clean water works well. The quantity of water produced is good and given it takes less than a minute it is very practical. The filter is easy to fit and remove and has lasted us so far. I can only say we have not got sick as to its effectiveness. There is some chlorine in some of tap water and this has removed the taste. It is not cheap but I think it is certainly worth the money.

21.03.2025

H**A

Llevo usándolo un año y sin rasguño alguno…

9.07.2022

ASIN	B09255PYRM
Batteries	Nonstandard Battery batteries required.
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	223,292 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 28 in Water Purifiers
Colour	Bali Blue
Customer Reviews	4.5 4.5 out of 5 stars (1,013)
Date First Available	25 Jun. 2022
Flow rate	22.5 Litres Per Minute
Installation method	Freestanding
Item Package Quantity	1
Item Weight	450 g
Item model number	411-BAL
Manufacturer	Grayl
Part number	GP_Parent
Power source type	Manual (Gravity-fed)
Product Dimensions	8.64 x 8.64 x 26.42 cm; 450.76 g
Special Features	Electrolyte & Sport Drink Mix Ready
Style	24 oz Water Purifier Bottle

GRAYL GeoPress 710ml Water Purifier Bottle - Filter for Hiking, Camping, Survival, Travel (Bali Blue)

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