I had the same issue twice. I called the tank manufacturer and they told me they only test the tank to 1 PSI. So if you fill the tank all the way and the water level goes up into the pipe a foot or so, the pressure in the tank will be greater than when it was tested originally. My gray water tank for the bath is leaking now. When the light says full, I dump. I know there is still room in the tank but I don’t wAnt to have gray water leaking out all over the place. Piss poor way to build a tank.
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