It just changes the color of the water. To remove algae, add calcium hypochlorite to the pool until the water turns gray, but do NOT add any cyanuric acid until the chlorine level returns to 5-10 ppm. To help your filter capture the then-dead algae, add cationic polymer. To prevent future algae buildup, maintain the proper chlorine level in your pool and add n-Alkyl and n-Dialkyl regularly.
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