Thanks, Speedbump for the advives on the float switches, I purchased the up/down floats switches from you and now I am ready for the next phase of pumping the water from the tank (1500 gal) to the irrigation system. My sprinkler zone is consumes about 17-20 GPM, the location of the tank and the sprinkler system is flat, the furthest zone from the tank is about 250 ft. I have an existing 20 gal pressure tank and pressure switch that i can use for this setup. I need your advice on the type and size of pump for this application. Please give me all the different options.