I have a deep well, about 260 feet. Currently there is a 1/2 hp pump at 80 feet but the pressure is very low for the size house and number of people living here. Also, during certain times the pump is uncovered due to the amount of water being used. The discharge pipe is 1". My holding tank is set for 40 to 60 psi. What is the largest pump I can get that has a 1" discharge and that will let me get to 120' plus?

Erik