PFAS and forever chemicals
The contaminant class the whole category is currently reorganising itself around, and the one where the marketing has run ahead of the certification.
Some filter jugs handle thisPer- and polyfluoroalkyl substances are industrial compounds that do not break down, which is where the 'forever chemicals' name comes from. Regulation has tightened sharply in the United States and is following in Europe, and every filter manufacturer has noticed. Read the claims carefully: PFAS is a class of thousands of compounds, most certifications cover only PFOA and PFOS specifically, and 'reduces PFAS' on a box can mean a great deal or very little.
How you know you have it
- Undetectable by taste, smell or sight
- Local water testing that has flagged it — in the US, published under the EPA's monitoring rules
- Proximity to a firefighting training site, airfield, or fluorochemical manufacturing
What works
LifeStraw Home, Clearly Filtered and Epic all publish lab testing specifically for PFAS reduction, and ZeroWater's ion exchange resin has been tested for it. Look for a reference to NSF/ANSI 53 or the P473 protocol and to named compounds.
What does not
Ordinary granular carbon cartridges — the mass-market Brita, PUR Basic and generic MAXTRA-fitting cartridges — do very little here, and mostly do not claim to.
Cartridges that reduce pfas
Ordered by strength of evidence, not by brand. An independently certified claim outranks a lab-tested one, which outranks a manufacturer’s word for it.
Partial reduction only
These reduce pfas as a side effect of what they are actually designed to do, rather than by targeting it. Real, but not the same claim.
Cartridges that do not
These make no claim here, and that is not a criticism — it is what their manufacturers say. Buying one of these for this problem is the mistake.
Questions
Does a filter jug remove pfas?
Some do, and most do not. LifeStraw Home, Clearly Filtered and Epic all publish lab testing specifically for PFAS reduction, and ZeroWater's ion exchange resin has been tested for it. Look for a reference to NSF/ANSI 53 or the P473 protocol and to named compounds.
What does not work: Ordinary granular carbon cartridges — the mass-market Brita, PUR Basic and generic MAXTRA-fitting cartridges — do very little here, and mostly do not claim to.