bobbyzat
Member
I just finished my auto top off about two months ago, and it has worked perfectly, so I thought I would tell everyone about it so they could use/improve on the system. It starts with my RO/DI unit, which has a 4 gallon pressure tank. I have a faucet for making new water, and a tube that runs to my tank coming out of the pressure tank. The tube goes into a normally closed solenoid valve that I actually found from a heating/AC store, cuz my parents had a humidifier put onto their furnace, and thats where I saw it. The bladder tank keeps pressure at the solenoid valve. I then built a small H frame out of PVC pipe I had laying around, and added a float switch. This sits in my sump The switch hangs from the crossmember, and as the water level lowers, it closes the circuit, providing current to the solenoid valve, allowing it to open until the water level increases enough to open the circuit again. After some consideration, I decided to add a second float switch a few inches high, so that if the first one gets stuck closed, the water will open the circuit with that one, stopping water flow. Once I got the crossmember level right, it works great, and is silent and virtually invisible.