Ceramic Rings Bio Media 17 oz. Highly porous efficient sintered quartz Bio Ring Media is ideal for optimal biological filtration. Bio Rings safe for freshwater and saltwater, they are created through the high-temperature sintering of inert quartz are the perfect substrate for biological filters where the main goal of the hobbyist is the development and growth of bacteria colonies (aerobic and anaerobic) on the large surface area available. Ceramic Rings Bio Media 17 oz do not release phosphates or heavy metals and do not effect pH of the aquariums, ponds, marine tanks or salt water fish tanks.
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