Based on an article from The MBR Site (1), the most common material used to make filtration membranes is PVDF, which could be classed as PFAS materials. PFAS (poly-fluoroalkyl substances) are also known as forever chemicals, which when discharged into the environment, it will remain in that form and never break down. Accumulation of large quantities of PFAS in the environment will cause widespread damage that can never naturally recover. Such membranes can potentially cause leaching of components or break down into PFAS chemicals, adding on to the critical issue of PFAS contamination.

If the purpose of such filter is to provide drinking water, then there are also possibilities of consuming such chemicals as leaching of PFAS chemicals remains a possibility. At Liquinex, all of our membranes are ceramic-based, which are completely inert and do not leach any substances into filtered medium.

(1) https://www.thembrsite.com/blog/pvdf-membranes-and-pfas-whats-the-difference/