Hello, I am Ronnie and I am from Cincinnati Ohio. First time pool owner, in ground, concrete 27K gallons, sand filter (unknown brand?) Heated. Surrounded by trees. 2015 was our first summer with the pool, it came with the house we bought. Frankly I could have filled it in with dirt and planed corn and been ok, but we decided to try it out for a year and see how it went. Well we fell in love and its here to stay. Now I need to learn!