aqua nature Ceramic Bio Filter Far-Infrared Bacteria House Biological Bacteria Nitrification Filter Media for Freshwater & Saltwater (Pack of 50pcs, Square Grey Thick ((NX-09)(14 Cm x 3.5 Cm))

This aquarium filter media serves mechanical filtration to catch fine particles and biological filtration for raising good stuff Premium ceramic media covered with thousands of porous tiny holes provides large surface area for bio filtration as well as filter out sparkling clear water Aquarium media block effectively absorbs fish waste and debris, providing crystal clear water for fish to thrive crack into pieces to any size needed, great for used in freshwater aquariums, planted aquariums, sumps and ponds