Ok, I had to setup a Windows XP virtual machine to check out the app.

The calculations between this app and www.poolcalculator.com dont really jive. I wonder which one is more accurate. The bleachcalc seems to be purely math... 1gal pool, 1 gal 5.25% bleach = 52500 ppm.. making it 10 gal pool just moves the decimal point. The poolcalculator says 54007 for the same values. I know its not enough to care about especially when you move the size of the pool up to 10000 gallons but I wonder where the poolcalculator is coming up with the difference.