The Via Aqua 4900 Power Head is a high-performing magnetic drive pump.Good choice for Saltwater aquariums and small to medium ponds/ water gardens and Biofloc system.The pump operates at low temperatures and is engineered with a self cleaning heavy duty open ceramic impeller, This Via Aqua Aquarium/pond/fountain Power head 4900 pump delivers hard working performance. Engineered with a sealed internal housing that insures whisper quiet operation.designed to be fully submersible and can be paired with wet dry filters,Venturi protein skimmers, under gravel filtering systems, ponds and fountains in both fresh and salt water.