I don't know how much you need, but when figuring it out take into consideration how much the solenoid valves, float valves, and Hydrominders will flow if all or most are on at the same time. The pumping capacity of the pumps isn't going to mean that much if they gravity feed from a tank.They want to know how many GPM I need but I do not know. 2 SS and 1 IBA touchfree.TIA