8.25% bleach

[mastamoon]

Thanks! Guess that app doesn't like running in windows 8 much, even in compatibility mode.

[Watermom]

No, that is one of the problems we have found with that calc. It doesn't like Win8.

[mastamoon]

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.

[let_her_flicker]

Here is the formula I use for manually calculating chlorine. 1,000,000/10,000 x .95 x 0.0825 = 7.8

One million divided by the total gallons of water in pool, then multiplied by .95 (121 oz of chlorine is converted to a decimal) x 0.0825 (% of chlorine in jug).

121 oz is the amount of bleach in the jugs of bleach I use.

Hope this helps you.

[kelemvor]

The pool calculator website is client side scripting so you can see the calculation by viewing the source. Here's what it's doing:

parseFloat(document.F.FCto.value)-
parseFloat(document.F.FCfrom.value)) *
GetGallons() / 482.202 * 6 / parseFloat(document.F.FCpcnt.value);
document.F.FC1oz.value=PutVolume(temp);

Which is basically Target increase*water volume /482.202*6/LC strength

Perhaps the difference is in order of operations or that 482.202 constant. I'm not intimate enough with the formula to know what that is for. I wonder why they didn't use 2,893.212 for the constant.