I think Chemgeek showed that chlorine loss as a percentage of the residual ppm increase with higher residuals. If you have a residual of 9 ppm, then it may not be unreasonable to lose 6 ppm.
I have a SWG and I know that I am putting in 2 ppm per day but my residual is also 2 ppm so technically, I am losing 100% of what I put in every day.
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