Automatic suck the air under the water, saving the gas-supply equipment, antifreeze, lower ... liquid mixers as one. It can be operated under the water, which can be placed in the bottom of ... is applicated to many links of the sewage water treatment, such as Pre-gas supply, Activated Sludge ... The features as follow:1.Automatic suck the air under the water, saving the gas-supply equipment, antifreeze, lower ...