Just to add to what Watermom said, your target chlorine level for shock should be about 15 ppm, and you especially want to bring the level back up to shock in the evening before bed, although the more times during the day you do that, the faster the pool will clear. I agree with her about waiting on the CYA--the algae is going to eat the chlorine up faster than the sun will, anyway. I would put a cup or so of muriatic acid in while the chlorine is under 10 ppm, wait an hour or so for it to circulate, then recheck your pH--it really needs to be in the7.2-7.8 range, but it will test falsely high when your chlorine is above 10.
Janet

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