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TGR in reply to @mespilus

Hypochlorite would prevent algae forming I suspect but it isn’t good for the feline.
Are there any cat friendly alternatives?

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mespilus in reply to @TGR

With hypochlorite it's a function of contact time and concentration of the hypo.
I suspect you are unable to kill off the deeper embedded algae, which then finds a protective surface free of any other life forms.

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