I use Coway, a Korean brand for my water filtration needs. They are a good brand and actually certified but looking closely at the product manual, they do not m

I use Coway, a Korean brand for my water filtration needs. They are a good brand and actually certified but looking closely at the product manual, they do not make the claim that they filter PFAS (defined as having a fully fluoridated methyl or methylene group): indeed they only claim to filter several chlorinated substances including tetrachloroethene.