Quick take
The correct OEM cartridge is FPPWFU01 / PWF-1. Compatible filters should explicitly list this refrigerator or part number.
Correct filter
Frigidaire’s owner-support page lists FPPWFU01 PurePour PWF-1 among GRSS2652AF accessories.
Replacement choice
OEM minimizes fit uncertainty. A compatible cartridge can be better value if its certification is clearly documented.
Avoid generic fit claims
“Fits Frigidaire” is not specific enough because Frigidaire uses multiple filter families.
Recurring brand opportunity
Replacement retailers can monetize the same owner repeatedly as cartridges expire.