... equipment, antifreeze, lower noise. Product DesciptionThe self-priming Submersible pump can be used for oxygenating and mixing in sewage ... water treatment. It integrates the pump, Air-blower, Gas-liquid mixers as one. ... saving the gas-supply equipment, antifreeze, lower noise.2. Bigger touch area of liquid and gas, higher ... , and difficult to be blocked up. Submersible pump