Hello TFP! This site is truly amazing. It’s great to see people helping people. As a pool owner for the first time, questions seem to be never ending. We have a 27000 gallon in-ground pool with a sand filter and in-line automatic chlorine feeder. I am already dealing with what seems to be a never ending green pool and cloudy water situation. After reading some of the threads on here, it sounds like I’ve been making several mistakes along the way. Including the pool store water testing and chemical buying nightmare.