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I'm shocking my pool and the FC should be around 17, but my test kit only has a scale from .5-5. How do i know if it reaches 17?

Like many others that I've read, I tried to fix my algae problem and avoid posting. All summer I've been seeing green algae groming in spots and simply shocked and scubbed, 2 weeks ago, problem got worse, green covering 1/2 the bottom of the pool (water clear). I read about shocking...