Tetra Whisper BIO-Bag Filter Cartridges, Large, 12 Count

New! UNASSEMBLED REPLACEMENT FILTER Keeps aquarium water crystal clear – removes odors and discoloration CATCHES DEBRIS Dense dual-sided mesh filters debris FITS TETRA WHISPER WATER FILTERS Color coded to make it simple to remember which replacement cartridge size to purchase CONVENIENT Easy to assemble and easy to replace USAGE Change monthly or sooner if needed