8.25% bleach

[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.