Round Ceramic Bar Filter Media, 9 Pack. Filter Media Bacteria House Bio Filtration Media Ceramic Filter Sump Canister Filter Media. PondH2o is long lasting ceramic media, highly porous ceramic material produces both mechanical and biological filtration. Much greater surface to allow very large bacteria populations to colonize. Ideal for Bakki Shower Filters, Koi Ponds, Fish Tanks, Aquariums, Freshwater, Trickle Filter, Aquaculture, and Marine environments. Reduces Ammonia, Nitrites & Nitrates. Round Ceramic Bar Filter Media improves Water Quality and Clarity. Long lasting, highly porous ceramic material produces both mechanical and biological filtration.