stop when it turns colorless, add the R-0003 reagent, and if it turns pink again retitrate to get your combined chlorine. If you let it sit you will have inaccurate results.
Re: new test kit - checking combined chlorine?
stop when it turns colorless, add the R-0003 reagent, and if it turns pink again retitrate to get your combined chlorine. If you let it sit you will have inaccurate results.
Retired pool store and commercial pool maintenance guy.
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