... .(3).River regulation: denitrification, dephosphorization, decarbonization, water purification.(4). Aquiculture (pond, fish farming and aquarium): denitrification, decarbonization, improve the living environment ... according to customer requirements. 4. The technical indices of Biocell filter media: SpecificationmmΦ25X12Φ25X9Specific gravityg/cm3>0.96>0.96Heaping numberPCS ...