Laboratory tests

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Laboratory tests to confirm, not to promise

Verifiable sources : Our filters have been tested in France by accredited independent laboratories COFRAC, in accordance with protocols that comply with the standard ISO/IEC 17025.
Important:No portable filtration system can guarantee absolute effectiveness in all filtration situations.
Performance always depends on the initial quality of the water that passes through the filter media.
Our commitment:To provide you with clear and transparent information so that you can make an informed choice based on the specific features of these products.

Certifications and warranties

NSF (National Sanitation Foundation - USA)

Nature: An internationally recognized private U.S. organization
Process: Voluntary certification; a fee is required to renew certification (annually)
Our product : The Disruptor® filter media used in our products is certified to NSF/ANSI 42 – "Drinking Water Treatment Units – Aesthetic Effects"

COFRAC (French Accreditation Committee)

Nature: Official French national authority
Process: Laboratory Accreditation According to ISO/IEC 17025
Our testing: Our filters are tested in France by independent COFRAC-accredited laboratories, in accordance with theISO/IEC 17025 standard

An independent double-check

Our filters have been tested in France by independent COFRAC-accredited laboratories in accordance with the ISO/IEC 17025 standard.
The filter media used in these filters is also internationally certified.

The combination of this certification and the analyses conducted in France by accredited laboratories ensures the accuracy and reliability of the results.

View our test reports

Quick overview ( and comprehensive view of the filtration spectrum)

Families surveyed	Test results
PFAS (Forever chemicals)	Measured reduction of up to 99.98% (< LOQ depending on test conditions)
TFA (a PFAS byproduct)	Not quantifiable after filtration (< LOQ under test conditions)
Pesticides & Metabolites	Reduction > 95% (< LOQ for most of the substances tested)
Heavy metals	90–99% reduction depending on the metal (aluminum, lead, arsenic, fluorine, mercury, cadmium, etc.)
Vinyl chloride monomer (VCM)	Not quantifiable after filtration (< LOQ under test conditions)
Bacteria (E. coli, Giardia lamblia, etc.)	Reduction of up to 99.999% (< LOQ, undetectable within the method’s limits) – including Legionella and Salmonella, pathogenic bacteria monitored by health authorities.
Virus	Discount of up to 99.998%
Drug residues / hormones	Significant reduction > 90%
Microplastics	Mechanically retained by the membrane tested at 1.25 µm
Chlorine & derivatives	Discount > 95%
Taste, odor, turbidity	A clear improvement, both in taste and appearance. Each user is, in a sense, their own “laboratory”

< LOQ = Limit of Quantification: the value below which the analytical method can no longer accurately measure the concentration of a substance. This means the substance is not quantifiable, but not necessarily completely absent.
The L2 filters used in our water bottles and our ÖKO TAP faucet system utilize the same filter media (Disruptor by Ahlstrom Munskjo)
The scale inhibitor built into the TAP is positioned downstream of the filtration process; therefore, it does not play a role in contaminant removal, which is performed upstream by the membrane.
Conclusion: The scale inhibitor in the ÖKO TAP has no negative impact on the filtration performance of pollutants.

This table provides a quick overview of the families of contaminants tested.
It does not replace the full reports: all detailed data (numerical values, limits of quantification, protocols) are presented below and available for review.
This allows each reader to verify the complete scientific results for themselves.

ÖKO Water Bottle

Test - Legionella

Test - Salmonella

Test - Rotavirus

Test - MNV-1

Chlordecone Test

Guava Test

Capesterre Test

IANESCO - 200 Contaminants - PRE-FILTRATION

IANESCO - 200 Contaminants - AFTER FILTRATION

Eurofins - PFAS

Eurofins - Fluorides

Eurofins - Heavy Metals

TAP WATER

IANESCO - 200 Molecules - PRE-FILTRATION

IANESCO - 200 Molecules - POST-FILTRATION

Eurofins - ÖKO TAP FAUCET UNIT

SGS - Scale inhibitor

L3 KIT

Legionella Test

Salmonella Test

Rotavirus Test

MNV-1 Test

IANESCO - 200 Molecules

Why did ÖKO EUROPE repeat all the tests?

To confirm the reliability of the analyses conducted since the product was launched, ÖKO EUROPE repeated all of its tests in 2025 through independent laboratories COFRAC-accredited (ISO/IEC 17025), such as Eurofins-Euraceta or IANESCO.

The goal was to demonstrate the reliability and effectiveness of the filtration technology, even after several years of field use, and to go beyond older certifications and tests.

The results are clear: filtration performance remains very high, with retention rates of up to 99.9993% for bacteria and a proven reduction of more than 200 contaminants (pesticides, heavy metals, viruses, etc.).

The tests were conducted on different types of water and under various conditions, thereby demonstrating the reliability and reproducibility of the results.

TDS-3 Stick: The Gadget That Fools Everyone?

Have you ever seen salespeople waving a TDS-3 stick around and claiming that the water is "pure"?

❓ The TDS-3: What Does It Actually Measure?

🔌 A conductivity test

The TDS-3 measures only the water's ability to conduct electricity. It displays an estimate of total dissolved solids (TDS), which is the sum of the ions present (mineral salts, sodium, calcium, magnesium, and sometimes ionized heavy metals).

⚠️ What it doesn't measure

The TDS-3 does not detect neutral molecules such as PFAS, pesticides, microplastics, bacteria, viruses, and drug residues…

👉 It’s a mistake to think that “0 TDS” means the water is pure. It simply means that there are almost no minerals left, which is bad for your health.

According to the World Health Organization (WHO), drinking fully demineralized water on a regular basis is not recommended: it deprives the body of calcium, magnesium, and trace minerals necessary for maintaining a healthy balance in drinking water.

✅ The smart filters from ÖKO

Our filters trap harmful contaminants (PFAS, pesticides, bacteria, heavy metals, etc.), while allowing beneficial minerals to pass through.

The TDS reading may remain stable after filtration (or vary slightly), but what matters are the official results that demonstrate effectiveness against contaminants not detectable by the TDS-3.

Tens of thousands of substances...

🔬 Tap water = thousands of molecules (natural + industrial).
❌ It’s impossible to test them all one by one.
🧪 Accredited labs test the most representative ones (pesticides, PFAS, heavy metals, microorganisms…).
📊 Results for these groups also reflect effectiveness against similar molecules.
💧 Conclusion: Tests show that ÖKO filtered water is healthier than “drinking” tap water.

Why is it beneficial to enrich water?

At ÖKO, we go far beyond the standards.

👉 Legal limit for the sum of 20 PFAS: 100 ng/L

👉 Water tested by IANESCO: 10,920 ng/L (109 times the standard limit)

👉 Result after filtration: 1.17 ng/L

➡ 99.98% removal rate

💧 Conclusion: If ÖKO passes such extreme tests, you can have a high degree of confidence in its performance when treating your everyday water.

Drinkable doesn't mean perfectly healthy

The potability of water depends on regulatory standards : When the level of a contaminant is below a threshold set by health authorities, the water is deemed “safe to drink.”

However, this compliance does not mean that it is completely free of undesirable substances.

Traces of PFAS, TFA, chlorine, pesticides, heavy metals, pharmaceutical residues, or other micropollutants may remain, at levels deemed “acceptable” by regulations.

The ÖKO approach goes beyond mere compliance by minimizing the presence of contaminants as much as possible.

Our goal: to provide purer water (with fewer contaminants than in the sample before filtration) for everyday use or travel, while reducing the environmental impact of single-use plastic bottles.

Limitations of our filters

What our filters DO NOT guarantee

Our filters significantly improve and ensure water quality, but *they do not turn all water into drinking water*.
Like any filtration technology, *they do not remove 100% of contaminants*.
Their lifespan depends *on usage and the quality of the filtered water* (presence of sediment, turbidity, etc.).
Performance may vary depending on *actual conditions* (water type, temperature, flow rate, maintenance).
The performance figures provided are based on tests conducted using new filters, in accordance with industry standards.
In short: no solution is perfect. But results from independent laboratories show that ÖKO filtration is among the most reliable and effective options available to the general public today.
Added to this is the overwhelmingly positive feedback from our ever-growing community of users, who attest every day to the effectiveness and comfort provided by our filters.
12,927 reviews

User Responsibility

Choose the appropriate filter type for the situation ( L2 for everyday use, L3 for high-risk areas)
Follow the instructions for use (clear, fresh water; change periodically)
Pre-filter the water if the spring water is cloudy or visibly contaminated

Why are our results reliable, and why can you trust ÖKO products?

To cast doubt on results is to cut oneself off from the seriousness and rigor that everyone deserves.
At ÖKO EUROPE, we work exclusively with independent laboratories COFRAC-accredited (ISO/IEC 17025), ensuring a structured methodology that complies with international standards.

The tests are conducted using standardized spiked water samples prepared in accordance with the specifications of these accredited laboratories, in order to ensure a reliable and objective basis for comparison between each test.

Transparent methodology
Full traceability
Reproducible and verifiable results

👉 This requirement ensures you can truly trust our products, backed by French and European regulations.
💧 And that’s what makes all the difference: choosing ÖKO means investing in safer water for you and your family.

Reproducibility and Controversy

Any serious challenge must follow the scientific method:

Buy the same products at the market
Fund testing at a COFRAC-accredited laboratory
Follow the same protocols and publish the results

Our commitment: transparency and continuous improvement

All of our results are obtained from independent laboratories accredited to ISO/IEC 17025 (COFRAC).

Errors in units or formatting may occasionally occur.
If you notice any inconsistencies, please let us know at info@okoeurope.com
We will review the information and, if necessary, update it immediately.

We believe in constructive and respectful dialogue: your feedback helps make the information more reliable, honest, and useful for everyone.