Bacteria House Bio Media for Bakki Showers &bull; Trickle Filter &bull; Aquaculture &bull; Ponds &bull; Aquariums by Cz Garden Supply The ABSOLUTE BEST bio media available! Made of long lasting, highly porous ceramic material pH neutral - Suitable for both freshwater and saltwater filters Effectively accelerates microorganism development; Removes ammonia & nitrites Only available from Cz Garden Supply (TM), USPTO and Amazon Brand Registry Protected