Very Interesting Problem

[waterbear]

WHOOPS!!!! This math is all wrong! 1 gallon of 12.5% chlorine will raise 1,000 gallons of water to 125ppm! 'Way, WAY too high. Lost a zero somewhere. It will raise 10,000 gallons to 12.5ppm, rather than 10ppm, assuming, of course, that the 12.5% didn't break down to 10% (which is likely). If it has broken down to 10%, then, of course, it will only add 10ppm, not 12.5

Math neve was my strong piont. Niether is typoing I dropped a 0! (and I treat 12.5% chlorine as 10% because it probably is by the time it goes in the pool! I was rounding off for simplicity. 100 oz is closer to 3 1/4 qts. (10 oz of 10% will raise 1000 gal 10 ppm) Thanks for catching that, Carl!

My point still holds. These pools are needing HUGH amounts of chlorine to reach breakpoint. 12 to 16 gallons in a 10000 gal pool means 120 or higher ppm chlorine!