After one.. two or more overflows with the RODI.. I rigged a sensor with an Avast solenoid. Works.. Wife has given green light to do water changes again.
it is the autoaqua level sensor, plus the solenoid from avast. The sensor turns off the plug that the solenoid is plugged into when the water level trips.
I thought I could use the skimmer sensor as well.. but it looks to require a clear/acrylic cup. The sensor portion is on the outside.