Unicel 4-Pack 70-sq ft Pool Cartridge Filter

This Unicel C 8465 Replacement filter cartridge has an outside diameter of 8.5" and a length of 10.5". This is the upgraded version that now services 65 square feet and has 234 pleats, instead of the old model that was good for only 45 square feet and used 162 pleats. This replacement filter cartridge is used as a replacement in Caldera Spas, Hot Springs Spas, and Tiger River spas.1 Buy = 4 Filters!