Aquacity Canister Filter Media Replacement Bags - Activated Charcoal Pellet Carbon, Bio Ceramic Rings, 1" Bio Sponge Balls for Aquarium Fish Pond Tank Canister Water Filtration Ready-to-use media filter bags, convenient for use with your canister filter, power filter, or pond filter Activated carbon helps remove odor, colors, organic pollutants, and waste Porous ceramic and Bio balls offer more surface area for cycle beneficial bacteria to colonize Each set includes: 1 lbs of activated carbon, 1 lb of Bio ceramic rings, and 50 pcs of Bio balls Mesh bag size: 8"x 5.5"