... and CPE Size and shape customized Bio media pond filter for pond, fish farming, aquarium, Koi filters and water ... : denitrification, dephosphorization, decarbonization, water purification.(4). Aquiculture (pond, fish farming and aquarium): denitrification, decarbonization, improve the ... requirements.4. The technical indices of Bio media pond filter: SpecificationmmΦ25X12Φ25X9Specific gravityg/cm3>0.96 ...