Ceramic Rings Aquarium Filter Media Z470921

Biological filtration media that helps remove ammonia in the water Good to use for both fresh and saltwater aquariums The ceramic bio rings filter media are extremely porous. Ceramic ring size: 1/2″x 1/2″ Package includes: 4 lb bio rings filter media in mesh bag Aquarium Fitler Media Ceramic Rings, Bio Ceramic Filter Media For Pond Fish Tank Canister Filter