Good idea on ditching the feeder too.
OnView attachment 176975 your other point, I checked on the fill pipe on my pool. It uses a floater like this, so I think I am OK and don't even need the backflow device or the cheap backflow valve. This rig appears to fill like a toilet. I need to take it apart to be sure, but I think I lucked out with this setup. Does this look right to you?
That’s what I have, too. It works well but mine must be hooked into the supply line for my underground sprinkler system for the lawn and the lawn guys shut it off to winterize. I’ve been watching the water level in case I need to top it off but there must be a way to shut off the sprinklers and leave the pool fill line open.