Premier Bulk Bio Ceramic Rings Filter Media For Aquarium Koi Fish Pond Reef Filter (5-Lbs)

Amazing well-made biological filter media boasts nitrification AND denitrification capabilities. High-performance media features unique pore structure and an exceptionally high surface area capable of supporting large colonies of aerobic and anaerobic bacteria. Suitable for both fresh or saltwater aquariums. also great for outdoor fish pond water fountain & waterfall.