We installed our TripleSafe sump pump which has a total of three pumps in total. The first pump turns on when water comes in and is able to pump out 2,220 gallons of water per hour. If the first pump can't handle the amount of water then the second pump turns on and is able to pump out an additional 3,900 gallons of water per hour. If the power is to go out then the third pump turns on and is able to pump out a total of 11,500 gallons of water.