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Algaecides are special chemicals that combat or
prevent algae growth. Algae comes in several
varieties and may appear as a soft green fl oating
mat or clump on the pool’s surface, a slime on
the pool bottom, black spots on the pool walls
or in crevices, or as a yellow dust on the walls
and fl oor. Algae is generally harder to kill than
bacteria, which is why you use a supplemental
algaecide in addition to bacteria-killing chlorine.
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