the blue color is very faint. It is possible that you are mistaking a very pale blue for clear. The color change will go from pinkish to purple to pale blue.
Re: hardness test with hth kit
the blue color is very faint. It is possible that you are mistaking a very pale blue for clear. The color change will go from pinkish to purple to pale blue.
Retired pool store and commercial pool maintenance guy.
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