I have a 10,000 square foot pool and live in Phoenix. The pool is very warm. I do not want to pay $1000s of dollars for a machine to cool it. On Amazon there are pool fountains for under $50 and the reviews say they really work. Do they? If they do are there any negative side effects? Any suggestions you have to reduce the temperature, without costing me a lot of money, will be greatly appreciated. Doug -