August water at 36 degrees: managing temperature, not just chemistry
The workable options, roughly in order of cost, are: running the pump and any water features overnight so the pool sheds heat to the cooler night air; shade sails or pergola coverage over part of the surface; evaporative aeration fittings on the return lines; and, at the top end, a dedicated pool chiller, often the same heat-pump unit that warms the pool in January run in reverse. Chillers are increasingly standard on new villa builds precisely because developers know August water temperatures make an uncooled pool ornamental.
If you are considering a chiller or a reversible heat pump, get it specified against your pool volume rather than buying on price alone. An undersized unit runs constantly, drives up the electricity bill and still leaves the water tepid. This is a job where collecting two or three written quotes with equipment model numbers pays for itself.