If it's green, it's alive. If it's dead, it's brown or tan.
BTW, green and clear usually means something besides algae. Algae is green and cloudy, or at least, green and hazy.
PoolDoc
PS. If it is algae, and you have normal chlorine levels, you'll need to raise levels till it dies. I've seen algae persist up to around 50ppm -- not thrive, but not die, either. Of course, you probably don't want to exceed 25 ppm with a liner pool, if that's what you have.
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