Unicel C-7492 Replacement Filter Cartridge for 100 Sq Ft Pac-fab Seahorse-400 Pool Filter | White | Compatible with Inground & Above Ground Pools

100 Square Foot Pac-Fab Seahorse-400. Replacement for: Pentair Pool Prod R173317 (Note: Four 100 Square Foot cartridges required.); Pentair Pool Prod R173317 (Note: Four 100 Square Foot cartridges required.); Pentair Pool Prod - Pac Fab Replacements 1722841 (Note: Four 100 Square Foot cartridges required.); Pentair Pool Prod - Pac Fab Replacements 172878 (Note: Four 100 Square Foot cartridges required.)