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Pool Floor Turning Black Afetr Adding Chlorine


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I have just added chlorine to my pool and the floor of the pool has turned black. The chlorine that I used has an active ingredient of Calcium Hypochlorite 650g/kg.

I have tested the PH and found it to be a little low, requiring some alkali to be added. Will raising the PH solve my problem.

I do not have any water test results for metals etc.

Can anybody help me. Please

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The chlorine may have oxidized ferrous iron to ferric iron and produced black iron oxides (though usually they are reddish-black). Was the water from a well? If so, it may have had high iron content. Usually there is more metal staining when the pH is higher, but if you had a lot of metals in the water then staining can occur even at lower pH.

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  • 7 months later...

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