I changed from a Baq. pool this season and couldn't be happier! I have had a crystal clear pool in these 100 degree days. My question is this: I am wondering if I am having to use too much chlorine? I have been using approx. 2- 5 gallon containers of 12.5%, I believe it is? every week, with putting in approx. 5 quarts an eve. The CYA is 40-45. PH is running a little high about 7.8- to 8.0 today (I put PH decreaser in tonight with the chorline). My levels are up in the A.M. with dropping during the day. Honestly I have not ever changed my sand yet. I was contemplating waiting until Spring, as we only have a few more weeks of real swimming weather in our area. Any feedback would be appreciated. We have an inground 20x40, 25,000 gallon, vinyl liner pool. Thanks! Just a note, the other levels have all seemed to be within good ranges.