10" x 4.5 Big Blue Empty Refillable Cartridge for 10" Big Blue Housing

Reusable and Refillable Filter Cartridge for 10" inch Big Blue Housing system.  Environmentally friendly, come with built-in pre and post filters to keep the media from being washed out from within the filter cartridge.  When media are exhausted, simply discard and refill the cartridge with new media. 

You can fill this cartridge with resins for mixed bed, carbon to improve odor and taste, calcite for pH adjustment.