I have an 18x36 inground pool, 8 feet deep, 3 feet shallow, pool math tells me it’s 100,000 litres (26,417 Gallons).
I have 1 x Skimmer, 3 x returns in pool and another 2 x returns in stairs managed by a separate valve.
I have a heater, SWG, and a 300 pound sand filter.
My current Hayward...