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The science behind Bachgold®
Our water filters are tested in independent laboratories according to NSF Protocol P231. Here, we transparently show the test results—and why the log value is more important than any pore size.
Our Principle
Tested by independent laboratories — no manufacturer self-declaration.
At BACHGOLD, we are passionate about developing high-quality products that enable access to clean water. We are aware that our customers' trust is always measured by the quality of our products.
For this reason, our intensive tests in independent laboratories ensure that our water filters meet the highest standards and function reliably — both to protect our customers and to uphold our responsibility as a company.
The testing procedure
Tested by an independent laboratory.
Our water filter was tested by an independent laboratory according to the requirements of NSF P231. The filter's reduction percentage against microorganisms is tested using E. coli as an example.
A certification standard from the National Sanitation Foundation for drinking water filters that reduce microbiological contaminants. The standard sets requirements and test methods that a water filter must meet — including specific water composition, multi-day test procedures, and defined filter capacity.
According to NSF Protocol P231 — 2014. Reproducible, standardized conditions that make effectiveness measurable over multiple operating phases.
Reduction effectiveness
Filter effectiveness across multiple operating phases.
The tests document the effectiveness of the BACHGOLD outdoor water filter over several operating phases - from initial commissioning to reaching maximum capacity.
Filter performance: Log 8 reduction - corresponds to 99.999999% removal. In the effluent water: no viable bacteria (NVC).
A standardized, globally recognized measure of effectiveness. A higher log reduction means more effective filtration. Recommended by, among others, the WHO and the US Environmental Protection Agency (EPA).
Due to its widespread presence, specific testing procedures, and its relevance to human health. Standardized + comparable - ideal as an indicator of water quality.
The Myth of Pore Size
Log reduction outweighs manufacturer's self-declaration.
The pore sizes of hollow fiber membrane filters are often mere manufacturer specifications and are rarely independently verified. Hardly any renowned standardization institute evaluates water filters solely based on pore size — filter performance depends on material properties, processing quality, and cleaning mechanisms.
The log rating offers a more reliable and comprehensive evaluation method, as it quantifies filter reduction and is based on standardized scientific principles.
Conclusion
Bachgold water filters are tested to NSF P231—by an independent laboratory—and achieve a reduction efficacy of Log 8 (99.999999%) against E. coli. This metric is the globally recognized standard for evaluating filter systems.
We share the data openly—you should know exactly what you're buying.
Frequently Asked Questions
The NSF (National Science Foundation) is an independent agency of the American government that develops standards, certification programs, and testing procedures in the field of public health, safety, and environment in cooperation with the WHO. NSF standards are recognized worldwide by government agencies, industry representatives, and consumers.
An NSF certification standard for drinking water filters that reduce microbiological contaminants. It specifies requirements and test methods — including specific water composition, a multi-day test procedure, and a defined minimum filtered volume.
A standardized metric used to quantify filter effectiveness. It indicates by how many orders of magnitude the concentration of impurities is reduced — log 1 = 90%, log 4 = 99.99%, log 8 = 99.999999%.
It offers a clear, simple way to interpret filtration performance. A higher log reduction value means more effective contaminant reduction. You understand at a glance how clean the filtered water will be.
It is based on scientific principles and is used in standardized test procedures. Renowned institutions such as the WHO and the US EPA recommend the use of log reduction to evaluate the effectiveness of water treatment systems.
Pore sizes are often mere manufacturer specifications without independent verification. Hardly any reputable standardization institute evaluates filters solely by pore size—the true filtration performance depends on material properties, processing quality, and cleaning mechanisms.
Want to dig deeper?
Do you want the complete test reports or have a scientific question? Write to us — we'll share everything we have.
