Darlly 50251 FC 1425 C 5625 PJ25 IN Spa Pool Filter Cartridge defilters Replacing the board addresses that Replacing the board addresses that deeper electronic instability instead of forcing homeowners to keep reacting to scattered problems Hose assemblies are practical replacement items when the original line has aged The Darlly 50251 filter cartridge is made for compatible filtration systems requiring 25 square feet of media with 2 3 8 inch top and bottom openings This is especially important in smaller systems where there is less room for tolerance and dimensional mismatches can create installation or performance issues