... filter media. Biocell filter media for pond, fish farming, aquarium, Koi filters and wastewater treatment. ... the aquaculture (pond, fish farming and aquarium). It can rapidly degrade water ammonia, nitrite, hydrogen ... farming water clear transparent, to improve the living environment of fish.Specification:Φ10X7mm, Φ10X10mm, Φ25X9mm, Φ25X10mm, Φ25X12mm. Biocell filter media for pond/ fish farming ...