Depends on the kind of hair algae you have. Hydrogen peroxide could kill some of them, or flourish excel, or bleach. If you have fixed the root of the problem, usually the best course of action is to prune off any algae covered leaves/moss and wait for it to grow back.
I have always loathed these algae killer products, right up there with pH down, and those cloudy water reducers as one of the stupidest products on the market, but of course that is just my op.
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