... bio media, Biocell, Biological filter media. Biocell filter media for pond, fish farming, aquarium, Koi filters and wastewater treatment.Biocell filter media is ... , maintain farming water clear transparent, to improve the living environment of fish.Specification:Φ10X7mm, Φ10X10mm, Φ25X9mm, Φ25X10mm, Φ25X12mm. Biocell filter media for pond/ fish farming ...