Does anyone use a pressure relief valve on their ballast system? I was wandering if you could find one to install as a full indicator. My system uses PVC pipe going to the sacs, but I only have one tube to each that is for filling and draining. I split it near the front of the run to go to the drain. What I was thinking about is adding a vent line to the system with a pressure relief valve that would release with a low pressure when the sacks are about full. Then I could know without looking that they are full and shut off the pumps. Any thoughts?
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