Quote Originally Posted by dansdad View Post
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?
Chlorine breaks down and loses strength. The higher the percentage, it seems the faster this occurs. So, your 12.5% may not be anywhere near 12.5%. Honestly, you might just be better off buying bleach. The turnover for Walmart's bleach is so fast that it is probably much fresher and closer to what it is advertised to be than some other forms of liquid chlorine.