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Which brings up another point...
Add a John Guest valve to yoru standpipes air intake. This allows adjustment. Attach an airline to the valve and curl it over and clamp it to the rim of the tank so that it is just above the desired maximum water level. If the water rises past that, it will block the airline and create a full siphon. This acts as a small failsafe in case somethin gets slightly out of whack.
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