At ÖKO Europe, a filter must remain clean, active, and replaced at the right time.
You don't have to do any calculations —we'll take care of it for you.
Automatic reminders via email, WhatsApp, or our free ÖKO Counter mobile app: You’ll be notified before the optimal date, so you’ll never use a filter that’s reached the end of its life.
Our smart ÖKO TAP calculator (just below) takes into account your actual water usage and the average water quality in your area (based on your ZIP code) to provide a personalized usage duration.
The result: replacement at just the right time—neither too early nor too late—to ensure your water always performs at its best, without wasting your filter cartridge unnecessarily.
Unlike fixed-schedule approaches, ÖKO Europe adapts the pace to your needs: your daily routine determines the schedule, not some arbitrary rule.
For optimal filtration, follow the recommendations provided and adhere to best practices for maintenance.
Hardness (explanations)
Water hardness, expressed in °f (French degrees), indicates the amount of calcium carbonate it contains:
0 to 7 °F: Very soft water (low in calcium)
7 to 15 °F: Freshwater
15 to 30 °F: Moderately hard water
30 to 40 °F: Hard water
Over 40 °F: Very hard water
👉 The harder the water, the harder the filter has to work to remove limescale and dissolved metals, whichgradually reduces its capacity.
Explanation of the Calculation
Our calculator uses official public water quality data, which is regularly updated based on your ZIP code, and automatically adjusts the filter capacity according to your water's hardness.
💧 Adjusted capacity (in liters) =
450 – (2.5 × water hardness in °f)
🔹 Real-life example:
💧 If your water is 40 °F (very hard) → 450 – (2.5 × 40) = ≈ 350 L💧 If your water is at 10 °F (soft) → 450 – (2.5 × 10) = ≈ 425 L➜ The harder the water, the harder the filter has to work to remove limescale and dissolved metals—which gradually reduces its capacity.
Between 7 and 11 centimes per liter
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Space-age innovation for your everyday water needs.
Originally developed for the International Space Station (ISS), ÖKO technology is based on an alumina nanofiber membrane combined with micropowdered activated carbon.
This combination provides fast and efficient filtration directly from the faucet, without the need for electricity or external pressure.
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Due to its nature and size, our ÖKO filter allows dissolved minerals (trace elements) to pass through: potassium, sodium, calcium, and magnesium.
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Estimated range:
Approx. 450 L per cartridge, or approx. 3 to 6 months, depending on the quality and quantity of filtered water.
Examples:
+- 3 months for very hard water
+- 4 to 5 months for average water
About 6 months for soft water
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The ÖKO TAP filter, tested in France by the COFRAC-accredited (ISO/IEC 17025) IANESCO laboratory, demonstrated a measurable reduction in more than 200 reference contaminants under standardized laboratory conditions:
PFAS, TFA, CVM, microplastics, heavy metals, pesticides, drug residues.
Detailed results are available on our Laboratory Analyses page.
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In France, tap water is safe to drink, meaning it meets current standards.
But between the treatment plants and your faucet, the water sometimes flows through old pipes that may leach small amounts of metals (lead, copper, nickel, chromium) or other residues invisible to the naked eye.
Added to this today are microplastics, which have now been detected in the majority of drinking water systems in Europe, according to several independent studies.
Analyses conducted by independent COFRAC-accredited laboratories (IANESCO, Eurofins) confirm that the ÖKO filter significantly reduces the presence of these contaminants to levels below the limits of quantification (LOQ)—in other words, undetectable under test conditions.
✅ Result: cleaner water that tastes better and is safer to drink straight from your tap.
The filter's performance depends on the initial water quality and on strict adherence to the maintenance instructions provided in the manual.
Keep this and be sure to replace the filter regularly.
Each user remains responsible for the water they choose to filter.ÖKO Europe cannot control all situations in which the product is used.
Any improper use (standing water, unsuitable liquids, risky handling) is the sole responsibility of the person who commits it.
Portable filtration device for personal comfort—not intended for medical use—compliant with European regulations (Directive 85/374/EEC and EU Regulation No. 1935/2004).Performance specifications apply only to pollutants tested under standardized laboratory conditions.
The complete analysis reports are available on theLaboratory Analyses page.
Filtration Technology
Scale inhibitor
Size
14 cm x 10.9 cm x 6.5 cm
Temperature / Bypass
Filtration ≤ 37 °C (cold/lukewarm water) to protect the membrane.
For hot water: activate the bypass → direct, unfiltered flow, ideal for cooking and dishwashing without straining the cartridge.
An isolated incident exceeding 37 °C is not critical; avoid repeated instances where hot water passes through the filter. Filtration quality could be compromised.
Weight
330 grams (empty weight)
Materials
Made of food-grade PP5 polypropylene.
The material can withstand temperatures up to 100 °C without warping, allowing for the use of hot water through the bypass (unfiltered).
Flow
The average flow rate is approximately 2 L/min, but it may vary depending on the system pressure (in bars) and water quality.
Water containing contaminants (e.g., sludge, particles, debris from construction work, or a treatment plant malfunction) may temporarily reduce the flow rate until the water clears up again.
Filter Life and Replacement
The filter is rot-resistant and has no expiration date.
When stored in a dry place away from light, it can be kept indefinitely without deteriorating.
When in use, it provides approximately 450 L of filtered water, or 3 to 6 months depending on water quality and household usage.
For hygiene reasons, ÖKO Europe recommends replacing the filter every 6 months at most.
➡️ In exceptional cases, if the filter is used infrequently, removed, dried, and stored properly, it can be reused up to one year later.
Warranty
The ÖKO TAP is covered by a 2-year statutory warranty that covers any material or manufacturing defects, in accordance with Articles L.217-3 through L.217-7 of the Consumer Code and Articles 1641 through 1649 of the Civil Code.
Maintenance and Faucet
Unscrew and rinse the mixer faucet regularly to maintain optimal water flow.
Clean the outlet screen to remove any visible impurities or particles that may accumulate there.
A disassembly wrench is provided to facilitate this process.
This screen acts as a mechanical prefilter: it traps the largest particles from the tap water before they enter the membrane.
Periodic cleaning ensures smooth and long-lasting operation of your ÖKO TAP system, whether the bypass is activated or not.
We already knew how effective the filter membrane in our ÖKO water bottles is.
What still needed to be validated was the mechanical system, designed from the ground up to offer you a reliable and durable product.
After several months of testing, it is now the
Jan Vansinte
Co-founder of ÖKO EUROPE
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