With a CYA of 40, chlorine of 5ppm is not at shock level. Shock level would be 15ppm. See the Best Guess Chart here for the connection between CYA and chlorine. http://pool9.net/cl-cya/
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With a CYA of 40, chlorine of 5ppm is not at shock level. Shock level would be 15ppm. See the Best Guess Chart here for the connection between CYA and chlorine. http://pool9.net/cl-cya/
thanks Watermom, more chlorine needed
need to add enough chlorine to bring it to 15. Pool store said 3 cases chlorine could that be right? 12 bottles of 12.5%
One quart of the 12.5% should add about 2.5ppm of chlorine to your pool. One gallon would add about 9.5. Use these as a reference to figure out how much you need to add after you test, to take your chlorine level up to 15ppm.
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?
Here's a neat little calculator you can use to help you figure out things like that.
http://www.poolcalculator.com/
Tom
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.
Did not know higher concentrations would go down faster. Thanks Watermom
Thanks Tom, I use the calculator all the time, but this is a % type thing