Originally Posted by Ricci
Hi - I think there is some misunderstanding about both flow and pressure and how they interact. Running the pump along with the city water will increase flow (gpm) and may also increase pressure (psi). Given those variables it is possible to have water from both sources at the same time. I sometimes shower with the pump when on city hookup and the reduction in the tank level is less than if I use just the onboard water.
Pump can't start unless city water Pressure is low enough for pump Pressure Switch to Close
Pump then increases pressure AND Flow in plumbing system
Increased pressure from pump will CLOSE the spring loaded check valve inside the city water inlet.....otherwise pump would push water into city water system via hose.
When system pressure goes high enough pump pressure switch will Open and city water will then flow again
1# higher pressure via pump will close the city water check valve