Quick take
The OEM replacement is FPPWFU01. Compatible PWF-1 cartridges can lower recurring cost when fit and certification are verified.
Correct cartridge
Frigidaire’s GRSS2352AF product page lists FPPWFU01 PurePour PWF-1 under accessories.
OEM benchmark
Use the OEM cartridge as the baseline for fit and stated performance.
Compatible replacements
A lower-priced compatible should explicitly document FPPWFU01 / PWF-1 fit.
Where to buy
Replacement-filter specialists can help compare multiple compatible brands for this exact cartridge family.