We used to have a swimming pool at our old house. Do you have any idea how much it costs to run? Ours was only a 15ft diameter pool (circular, below ground). It was outside, and heated throughout the summer months during the daytime only and had a solar blanket type cover on it during the night.
We were on a water meter, but the topping up due to evaporation and use by the children didn't cost too much as we relied heavily on rain water to fill it up, but we did hav to use the hose in very hot weather a couple of times a week.
A large canister of chlorine powder (called Shock) costs about £40-50 and lasts only a couple of weeks. And that was with a really small pool. One which is being used by clubs etc wouold require far more maintenance and more outlay.
Added to the chlorine treatment, you have to maintain the pH levels. You tests the water with little litmus sticks which tell you pH, chlorine and other water levels. You then have to add pH Lower or pH Higher to the water. These cost a bomb too.
Then there are the Sparkle Tablets that you put ion the filters to keep them clean and to make the water litterally sparkle.
The whole marlarky costs a fortune and this is without heating costs. Ours used to cost us, and I'm not joking... £900 on top of our usual electricity bill just for the months of May, June, July & August to heat the pool enough to swim in. Othyer maintenance involves scrubbing the algae off the sides once a week, hoovering the bottom daily anf doing a weekly "backwash" through the filter". Time-consuming and a PITA, although free, I suppose.
In my opinion, swimming pools are a complete money pit, a headache and a waste of time (unless you are millionaires). I would NEVER have some again. (Although our 3 boys taught themselves to swim in it, so saving on lessons I suppose).