Use this link: http://poolcalculator.com/index-classic.html
I would not use in IE only because I don't know if they have all of their bugs fixed as of yet. I'm personally using Chrome and it's working just fine. When I initially began using this calculator I was entering my pool gallons using a comma (ie 13,600). I finally realized this was my problem all along. DON'T use the comma!
Set up your ranges at the bottom of the calculator using 'Traditional Pool', etc. Make sure you enter the percentage of bleach you are using (6%, 8.25%). Also don't forget to enter the pool temp if you know it.
Enter what your test results are in the 'now' column, and what you want them to be in the 'target' column. If using liquid bleach it will give results in ounces. However, if you hover your mouse over the ounces it will give you gallons , quarts, cups; etc. in the field just above it.
IMPORTANT!! A jug of 8.25% liquid bleach is NOT a gallon. It equals approximately 3 quarts and 3 cups. Shout out to Pool Doc for reiterating that as I would have forgotten!
Hope it all works out for you now. Pools are hard enough to keep up without having the added frustration of the darn calculator not working! Best of luck!
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