We are owners of a pool that we did not put in and do not have all the deets on as far as all of the equipment. We manage it ourselves, with the first few years constantly adding chemicals recommended from the pool store. We then had a few years of simple shocking and adding the tabs and all was fairly good. Then more recently using the costco tablets HTH Pool Care 3 in chlorine tabs with added clarifier.. starting last year, our CYA started showing high and after reading some of info here, found out we should be using liquid chlorine. So now ordering the TF100 kit and trying to get the CYA down. I also downloaded the app to start entering my readings. Hoping this will do the trick...to get our pool chemistry back in lien