Hillegom:
I don't have an electronic solenoid valve on my water supply, just a manual one. That would certainly work to shut everything off and would really make an ASOV redundant.
Lol, well now I'm feeling just a bit sheepish. I totally forgot I ordered an ASOV and check valve from Ray and it just showed up. So I went downstairs to hook it all up and upon closer inspection (a lot closer) there is a ASOV hiding way in behind my dual membrane that I never saw there before. But there isn't a check valve. So I inserted it and now my waste water does stop (albeit after about 3-5 min) once the pressure rises enough to cut out the booster pump.
So I guess that at least helps to shut it off if I forget to turn the system off.
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