Rio Plus Aqua Pump / PowerheadRio Plus Aqua Power Head Pumps 50, 90, 180 are most often used for table top fountains, Rio 400, 600 are perfect for small aquariums and larger fountains and Rio 1100, 3100 are great for aquarium or pond use. For wet dry filters, venturi protein skimmers, undergravel filtering systems, ponds and fountains Use as a submersible pump only! Inlet screen prevents debris from damaging the impeller Rio pumps are submersible and are not to be used as external