August water at 36 degrees: managing temperature, not just chemistry
By August, an unshaded villa pool in Dubai or Sharjah can sit at 34 to 38 degrees, which is warmer than most people's comfort limit and close to useless for actual swimming. Warm water also holds less dissolved oxygen and hosts bacteria more happily, so temperature is a hygiene issue as much as a comfort one. There is no chemical fix for hot water; there are only mechanical and scheduling ones.
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.