Activated carbon will remove the larger chain PFAs, but is not as effective as removing the smaller ones. From the paper:

> Conventional water treatment employed at municipal drinking water treatment plants have been shown to be nearly ineffective at removing PFAS. This can leave the burden and cost of implementing more sophisticated water treatments to brewers unless public water suppliers implement tertiary treatment to remove PFAS from finished water prior to distribution. Anion exchange and activated carbon treatments have been shown to more effectively remove longer-chain PFAS and PFSAs but were less effective in removing PFCAS and the alternative shorter-chain PFAS and PFECAs. Reverse osmosis treatment showed significant removal of PFAS of different chain lengths in drinking water, but can be prohibitive due to high operational costs and energy usage. In areas with known contamination, beers from macro- breweries were less likely to have detectable PFAS than craft beers brewed at a smaller scale, potentially due to more effective and expensive filtration of tap water at larger breweries.