Hi. My name is Andrew. I have a semi-in-ground oval vinyl pool. Last year before the season ended my SWG died. I decided to wait until this Spring to replace it. Boy was that a bad ideas. Four weeks ago my pool looked like an old stagnant pond. I began the transformation by taking advice from pool owners and a local pool shop. The pool shop is great but they sure like selling you a lot of expensive chemicals. I soon ditched the pool shop and relied on the advice of the pool owners. While doing all this I stumbled across a web site, “Trouble Free Pools” and it really opened things up for me. With the help of the calculator I was able to adjust the balance of my water easily. Today the pool is crystal clear and sparkling. I now subscribe to the app and us it to track my water’s levels. I truly am happy I ran across that site and ended up here.