Darlly 50354 FC 0004 FC 0300 5CH 35 PMAX50P3 Pool Spa Filter Cartridge floatingfeeders The grouped application references give The grouped application references give this cartridge practical value because the best replacement results come from matching the filter to recognized cross reference identifiers This type of part is especially useful when the filter canister remains serviceable and the issue is centered on the cartridge itself The spa and pool versatility gives this cartridge practical value because some cartridge formats serve multiple water systems while still requiring the correct reference fit When the cartridge media becomes dirty or less effective