Stupid Question About "Auto-Fill".

There is either water coming in from the baffle inside skimmer or it has side ports yiu may feel with your fingers. It's likely not an auto fill just a means to top off. They may have even tapped a nearby plumbing line. Next time the pool is low let it run for an hour and see what happens I bet ur water goes up. Reference the skimmer for water height or use piece of tape
 
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