The pump has a vertical pipe connecting it to the main outtake pipe leading to the sewer. There is a brass check valve in the connector. When it starts up, I hear hmmmm, then HMMMMMMM, and then a ...

Each of the 11 rows has a dedicated water pump that puts out up to 140 gpm (28 gpm/jet) enough to let each jet climb 16.5 ft into the air.