I agree with MBar. If the FC is not holding something is eating it up. Metals don't do that. Take care of the chlorine demand first and then worry about treating the stains.
Re: green water - I don't think anymore algae
I agree with MBar. If the FC is not holding something is eating it up. Metals don't do that. Take care of the chlorine demand first and then worry about treating the stains.
Retired pool store and commercial pool maintenance guy.
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