Are you up for DIY job?
A couple float switches can be found on ali express and wired into a Neptune Breakout box (you can DIY that too!) along with a 24 volt solenoid (again, aliexpress) tied into the 24v port of the Apex for a rock solid ATO. I'm doing the exact thing - total cost in was $22 including building the breakout box. External links not allowed here but if you PM me I can send you a parts list.
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