This listing is for 2 filters.Features:9.75" x 2.5" Cartridge Size3,500 Gallon Capacity10 MicronGranular Activated Carbon and PolyphosphateThe Ultra Slim Line, or CS-Series, filter element is engineered to fit any 9-3/4" housing including the narrower models now on the market. The Slim Line includes all of the engineering features available on the OC-Series in a small, slender profile.
