Which filter flask for 
your travels?

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?

Camping 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.

Hiking water bottle

2

Hiking / Trekking

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

Travel water bottle

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.

Displacement filter flask

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?

The following list is provided as a guide to urban and rural water quality. It is important to note that this information cannot be set in stone, as conditions can change extremely variably. 
It all depends on where you filter your water. 
In natural environments, always use the clearest, most flowing water available. 
If the water is too cloudy, pre-filter it with a cloth to remove larger debris that could clog your filter more quickly. This may seem obvious, but it's essential to remember. Keep in mind that pathogens dangerous to health (viruses, bacteria, protozoa) are invisible to the naked eye.

Here's the list of countries where ÖKO's L2 and L3 filters are most effective (CLICK ON IMAGE TO VIEW PDF):
OKO water bottle What countries
You are responsible for the water you filter. There are trillions of possibilities for filtering water.

Always use the cleanest, clearest, most flowing water possible. 

Avoid muddy, stagnant water unless you have no choice.

As a precautionary measure, when traveling in regions where water quality is less controlled, it's always a good idea to carry water treatment tablets, such as Micropur or similar brands. 
If you have any doubts about the potability of your water, use these tablets, then filter the water with the ÖKO filter. This eliminates the unpleasant taste of chlorine and makes the water more pleasant to drink.

Although this may shorten the filter's life due to the high chlorine concentration, it will enable you to drink more pleasant-tasting water.

An overview of the quality of the world's water sources

Improved drinking water sources are those that have the potential to provide safe drinking water due to their design and construction, and include: piped water, boreholes or tube wells, protected wells, protected springs, rainwater, and packaged or delivered water.

Source: WHO/UNICEF Joint Monitoring Programme for Water Supply, Sanitation and Hygiene (JMP) (2024) - with major processing by Our World in Data

Last update: January 6, 2024
L1
Water quality regulated and monitored. 
Filtration is recommended at home to remove chlorine, increasingly stubborn pesticides, PFAS, etc.
Filtration is inadequate for outdoor water sources and streams.
ÖKO L2
Water quality regulated and monitored. In 2025, repeated scandals are prompting us to filter so-called "drinking" water. 
The L2 filter housed in the original ÖKO water bottle is recommended.
ÖKO L3
Poor water conditions. Water treatment is strongly recommended. In extreme circumstances where water sources are scarce, the ÖKO L3 filter (absolute pore size 0.1 micron) is recommended.
TAR (Additional Treatment Required)
Does not meet drinking water standards for filtration alone. Micro-pure water (chlorine chemical treatment) is recommended.
RE-PASTE water through your L2 filter => no chlorine and much more pleasant to drink
ATTENTION: your filter will wear out faster because the standard concentration levels are much higher than normal (NSF concentration levels).

How to filter uncontrolled water?

NEVER PLACE THE CAP and PIPET in the water. Only the body of the gourd and as gently as possible.

NEVER put your fingers in your mouth afterwards without cleaning them first. 

NEVER put your mouth to the pipette to avoid contamination from outside the gourd. 

Be as hygienic as possible when filtering dubious water. You'll avoid any gastric problems that have nothing to do with the filter itself.
ÖKO filter

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. 

30.00 EUREUR 30.00
Pre-filtering fabric

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.

SWIG filter straw

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.

39,00 EUR
Micropur tablets

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. Note that 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.