Quote Originally Posted by aylad View Post
The calculator that we're using is called bleachcalc, and it was developed by mrsmith, a former member of the forum, and further refined by a current member of ours, chem_geek.
Just FYI -- I helped with The Pool Calculator, but didn't have anything to do with BleachCalc. Michael gets all the credit for that app. Note that there is one error in the app with respect to borates so don't use it for that calculation; for everything else, it's fine.