ok Watermom let me get this straight, because these numbers are what I will use from now on when testing. Lets say I have 1 ppm in my pool and I need to raise it to 10.5 then I only need one gallon? If that's the case I need to wonder why am I using so much chlorine on a weekly basis? I normally add a gallon and test and it usually comes to 3.0 So what could be going on here?