I only ask because I have been having problems lately with my RO/DI systems and I think it may be from over-pressurizing. I have fairly low pressure in the house and boost it too, but my shut off valves don't seem to work right and the booster pump ends up hammering the RO/DI. In normal operating mode I am getting about 60 psi at the membrane, but when the shut off doesn't work, the pressure pegs repeatedly until i shut the pump down. I think I may have damaged my membranes.