Bio filter media for Pond, Fish Farming, Aquarium and Water treatment Material: PP, PE, HDPE and ... Bio media pond filter for pond, fish farming, aquarium, Koi filters and water treatment.1. Product Description of Bio media ... decarbonization, water purification.(4). Aquiculture (pond, fish farming and aquarium): denitrification, decarbonization, improve the living environment of fish.(5). Biological ...