ShopWhat is PFAS, and why is it in your water?
PFAS (per- and polyfluoroalkyl substances) are a family of thousands of synthetic chemicals used since the 1940s in everything from firefighting foam to non-stick pans. They are called forever chemicals because the carbon to fluorine bond does not break down in nature. What enters the water cycle stays there.
Why it matters in Sweden
Swedish drinking water regulation follows the EU Drinking Water Directive, which sets a limit of 100 ng/l for the sum of 20 PFAS substances. Sweden adds a stricter limit of 4 ng/l for four of them (LIVSFS 2022:12). Both limits apply to drinking water producers. Your municipality publishes its own most recent analysis on its website.
How ion exchange filtration works
Our filter medium is an anion exchange fibre supplied in chloride form, with a polyacrylonitrile matrix and a fibre diameter of about 30 micrometres. Most PFAS are acids that carry a negative charge in water. An anion exchanger holds chloride ions on its surface and can swap them for other negatively charged molecules, including PFAS. Because ordinary tap water also contains chloride, sulfate and bicarbonate, which compete for the same sites, real world capacity depends on local water chemistry. That is what our testing is designed to measure.