Why choose the ÖKO filter flask?
Filtration of potential pollutants in drinking and non-potable water: Eliminates pathogens* such as viruses, bacteria, micro-organisms and pollutants* such as PFAS, heavy metals, chlorine, pesticides and much more thanks to a system patented by NASA.
*Those tested in laboratories.
Fast filtration rate: Filters a liter of water in around 30-40 seconds, faster than equivalent filters.
Optimized ergonomics: easy to handle, even for children.
Large opening: fast, convenient filling thanks to wide mouth.
Removable hook: Attaches to the backpack, with the possibility of removing the hook to reduce weight.
Hygiene assured: teat protected by a pipette guard to prevent dirt and dust (can be easily removed for cleaning)
Aesthetic design: Attractive and modern, encouraging you to take it everywhere with you.
Versatility: this water bottle will take you absolutely anywhere.
Leak-proof, shock-proof, scratch-proof: Designed to withstand shocks and not leak.
Hygienic pressure system: Allows other bottles to be shared or refilled without direct contact, guaranteeing improved hygiene(just pressure, no suction!).
When should you choose an ÖKO water bottle?

1
At home or on the move
Use the taps provided to filter your drinking water. Fill your glass, coffee machine, kettle or carafe.

2
Hiking / Trekking
Whether you're hiking, trekking, bivouacking or surviving, the ÖKO water bottle filter turns any natural water source into drinking water.

3
On the road
The ÖKO water bottle becomes your best ally when traveling, turning every drop of local water into a reliable source, whether you're exploring the city or more remote regions.

4
By train, by plane, by boat
Have you ever thought about the price of a bottle of water on a ferry, train or plane?
ÖKO filter flask user reviews
In which countries can I use my ÖKO water bottle safely?
An overview of the quality of the world's water sources
Source: WHO/UNICEF Joint Monitoring Programme for Water Supply, Sanitation and Hygiene (JMP) (2024) - with major processing by Our World in Data
How to filter uncontrolled water?

1
Tip number 1
Always carry one or more spare filters. It weighs just 47 g and takes up no space. You may need to filter heavily contaminated water, which will more quickly clog the 400 pores that make up the filter.

2
Tip number 2
Use a filter sock or cloth to pre-filter your water if it is contaminated with mud, for example. You'll preserve the life of your filter, and therefore its filtration efficiency.

3
Tip number 3
If you're going trekking in hostile places and countries over a long period of time, be sure to use ÖKO's L3 filter, a high-performance filter calibrated to 0.1 microns for use in high-risk areas. For emergency use. Weighing just 58 grams, it won't weigh you down.

4
Tips 4 and 5
If you're going to "hostile" countries, carry micropure tablets with you in case of doubt about water quality. Available from chemists or online. Rinse the water in the flask to eliminate any unpleasant taste or odour. Beware: the filter will not last as long as the 400 L, given the high concentration of chemicals.
Be wise and always opt for the clearest, most transparent water possible when you have the choice.