Power Discharge Pump for Pedicure Chair - Complete setDo I need a discharge drain pump for my pedicure chair? If the drain pipes under the floor or on contact with the floor, floor drain or gravity drain, then you don't need to install a discharge drain pump. If the water pipes above and do not contact the floor, floor drain or gravity, then you do need a discharge drain pump. Discharge drain pumps water from spa tub out to pipe against gravity to existing sink or wall drain. Saves thousands of money