</font><font color="blue" class="small">( -do you have a vacuum breaker on the line between the well and the tank to backup the check valve to prevent siphoning back to the well? )</font>
I did not install a vacuum breaker because the way the system is plumbed, the well water is a separate circuit. There is a 24 volt solenoid valve that turns on / off a water valve from the well pressure tank that goes into the cistern tank. When the valve opens, well water is allowed to flow (under pressure) into the cistern tank through a check valve, when the solenoid valve closes there is no back flow from the cistern tank back to the well pressure tank
1. Because the solenoid is closed and
2. There is a check valve.
I think this should be sufficient protection? Besides that, the water in the tank is from the well anyway, they are one in the same or is this not correct thinking?
Basically the Cistern tank is like a huge capacitor, well water fills the tank very slowly 24/7 then we pump the cistern water through the house plumbing. Water is filtered from the well before entering the cistern tank then it is filtered again as it is pumped out of the cistern tank into the house Then it goes through a water softener and for drinking / cooking water we have a Reverse Osmosis system in the kitchen.