Darlly 41002 FC 2397 C 4999 PRB100 Spa Pool Filter Cartridge safety This replacement is especially useful This replacement is especially useful when the original internal is cracked This type of part is especially useful when the surrounding spa systems remain serviceable and the need is centered on the topside panel itself The multiple application references give this cartridge practical value because filter matching is most dependable when tied directly to known cross reference identifiers This type of replacement is especially useful when the filter housing remains serviceable and the cartridge itself is the main service item