A super porous bio-media engineered to provide superior bio- fare with good water flow for efficient removal of ammonia, and nitrite. Use with One & Only Live Nitrifying Bacteria to establish a superior biofilter. Use 1 cup (240 ml) of Re-Mover™ for every 15-25 gallons (57-95 liters) of water. Re-Mover™ does not usually have to be used in a filter bag. Place in your sump, filter, canister filter or other part of the system where there is good water flow. Re-Mover™ does not need to be replaced, it can be rinsed and re-used if necessary.