free chlorine lower than total chlorine
Higher pH drastically reduces the sanitizing power of the chlorine due to reduced oxidation-reduction potential ORP while lower pH causes bather discomfort especially to the. Im very happy with this product with one caveat.
Just be aware of.

. When any of these pool chemicals are used it is very important to keep the pH of the pool in the range 72 to 78 according to the Langelier Saturation Index or 78 to 82 according to the Hamilton Index. The PH reading on the strip reads low compared to my liquid reagent kits I trust the liquid above these strips and all other strips Ive used in the past. Total Chlorine is a combo of used up chlorine and free chlorine Most strips and OTC reagent kits only give Total Chlorine TC reading which is not helpful at all.
A How To Guide 7 Tips To Lower Chlorine Levels In Your Pool
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