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Algae is best removed by first making sure that your filter is freshly backwashed, then by disturbing it with a brush getting it into the water if it is growing on the surface.

Then a chemical treatment by using a good quality liquid algaecide along with a shock dose of chlorine at a dosage rate suitable for your pool size. Here is some more info here pool-tips: 52-algae

The algae will then either get trapped in your filter which you can backwash out, or it may settle on the floor of the pool which you can then vacuum it down the drain with the filter set to ‘Waste’