If you are looking for a reliable automatic pool water leveler, I will save you some time and money by sharing a few facts about water levelers. Right out of the gate: Stay away from any auto fill device that hooks up to a garden hose! They are constructed mostly of plastic parts that can and will warp or become brittle from the ultraviolet rays of the sun.
Consequently, they are susceptible to sticking and jamming, resulting in a pool overflow with possible flood damage. Secondly, the hose itself is a liability due to the likelihood of it weakening by swelling and bursting. Imagine this happening while you are on vacation