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_Samuel_

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About _Samuel_

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  1. I worked some numbers and came up with a formula for chlorine demand. It's: CD = 1 - deltadays_root(ppm_end / ppm_begin) Where: deltadays = the number of elapsed days deltadays_root = take the nth, deltadays, root, so if deltadays was 2 it would be a square root, if 3 then cubed root, etc. ppm_begin = starting ppm ppm_end = ending ppm I've cross checked the formula with a few points in the table (in this thread) and the numbers match up. I was using excel to make the calculation and there isn't an nth root function available. You can use 1/del
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