One thing to take into account with rain water is that there is acidic rain and it will lower the pH and have an effect of your TA. It might be interesting to collect a sample of rain water and test it.
Re: Residual Chlorine Value?
One thing to take into account with rain water is that there is acidic rain and it will lower the pH and have an effect of your TA. It might be interesting to collect a sample of rain water and test it.
Retired pool store and commercial pool maintenance guy.
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