Ok, i traced the lines and they seem to be installed correctly as far as i can tell. All 3 resins are plumbed after the other canisters and membranes. I adjusted the pressure on the booster which seems to fix the problem...mostly. When I power the system and the valve to the RO water tank is closed it still vibrates but when it is open and I manually lift the float valve the system shuts down and all is good, no problems. Should the last valve and the pressure switch be reversed?