When pumps run hot, the strainer basket can warp from the heat. Steam is generated in the pump when it runs dry and gets hot. If not realized soon enough, it can cause other problems like a warped shaft, a leak at the shaft seal, the electric motor can overheat and fail, the seal plate can warp, the steam can break down the joint stick that seals the threads on the pumps intake and return nipple, and the steam can debond the PVC glue on fittings near the pump causing leaks. Keeping the water level up is important and will save you money on costly repairs. With a set up like this, the hose used to connect the auto leveller to the spigot should be inspected often and replaced every year. When the hose is under pressure for long periods of time, it can fail at its joints and they do dry out from being in the sun. Hoses are not expensive in a 5/8" diameter and are often on sale.