I recently had a new pump installed and my system serviced. I replaced my Square D 40/60 switch because my contacts were shot. A "friend" recomended that I adjust the switch to a 50/70 setting and only put 40 psi in the pressure tank. I heard that the 50/70 setting is better for the pump especially when you have an irrigation system, which I do, but I never heard of setting the pressure 10 psi below the cut on pressure. Could you help me understand this concept or is my "friend" just looking for a return visit to replace the pressure tank?