Any sources on what filters are effective?
"To know if a filter is NSF certified for the removal of PFOA and PFOS look for NSF P473 or NSF Certified to Standard P473 on the product, packaging, or specifications. Two types of filters recommended are granular activated carbon (GAC) and reverse osmosis (RO) filters."
(https://www.canr.msu.edu/news/list-of-household-filters-appr...)