Quick take
Use FPPWFU01 / PWF-1 or a compatible cartridge that explicitly names this filter family and refrigerator model.
Manufacturer mapping
Frigidaire’s FRSS2623AS product page lists FPPWFU01 PurePour PWF-1 among the refrigerator accessories.
OEM vs aftermarket
OEM provides the baseline for fit. Aftermarket replacements compete mainly on cost and certification.
Why the exact code matters
Frigidaire uses PWF-1 and PWF-2 families, so matching the part number avoids ordering the wrong cartridge.
Cost per year
Two recurring purchases per year can make compatible-filter savings meaningful.