Aquatic Life 10" x 2.5" Clear Refillable Cartridge for DI Resin and Other Media Ideal replacement for DI Resin, Carbon, and other media used for the water purification process. Fits standard 10" cartridge housing - Designed for upflow applications to ensure the longest possible exposure time. Twist-On Cap with Fine Filter insert and Sponge to prevent filter media flow out. Rubber gasket ensures tight fit and prevents leaks. Compatible with Captive Purity, Kent Marine, Seachem, Coralife, BRS, and most other residential or aquarium DI or RO/DI systems.