Hi Jim,

First, go to More Calcs and click on Pool Volume. Put in the dimensions of your pool in the box that fits the pool description (rectangular etc). The settings tab in More Calcs lets you choose between litres and gallons.

Now you can go back in the main screen and enter your pool volume and your bleach strength. In the Chlorine section of the forum, you will find Ben's Best Guess chart for figuring out the chlorine level you need based on your CYA level. Find your target chlorine level and look at your free chlorine test reading to see how much you need to raise your chlorine level up (in ppm). Put this number in the program and hit calculate and it will tell you how much bleach you will need to add to your pool to make that happen. Hope this helps.

Peter