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Have you considered going to a pressure system.
We go through those pumps in the big rigs here all the time. The problem is when they sit the rubber seats deform over time and they loose their ability to keep pressure. By installing an accumulator down stream from the pump it keeps pressure on the valve/piston seats, keeping them in shape and sealed. Plus you don't have that pulsating pumping action but a steady flow. You'll have to install faucets that shut off and keep the pressure just like at home. It's best to leave them on all the time.
There is the air pressure system also, using an air pump to create the pressure. The water tank is pressurized forcing the water out. But you would have to put in a tank built for pressure.
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