Automatic levelers sound really cool, but they are no more complicated than a toilet tank. They work the same way-- a float arm drops and opens a valve. When it hits the target, it turns off. There are simple, over-the pool-edge ones that work fine. Sump crock pumps work the same way.

An automatic leveling drain is even simpler--no moving parts needed! Mine is a standard return, the goes to a pipe that rises to the desired level, then drops into a drain...like a J-Trap under your sink turned upside down.

Carl