My mother in law has an 8ft deep well and the pump has to push the water up hill about 400 feet to the house and a few outside faucets. We have a pressure tank at the pump above the well. Her flow is good but what I consider slow in the house. My question is couldn't I install another pressure tank in the house where the main line comes in or some where else in the house on the system? It's basically a hydraulic system and the pressure tank is an accumulator so it should work. My brother in law says a pressure switch would have to be put where the pressure tank is. I don't agree. A second tank would just cause the pump to run twice as long to build up pressure to fill both tanks. But the tank in the house would not have to push the water as far to the points of usage is my argument.