dm3216 -- Go ahead and just start using the bleach. The fact that you've been using cal-hypo doesn't affect it at all. In fact, some people, including moderator Poconos, use a combination of cal-hypo and bleach. You are right to try and keep it at shock level for another couple of days. The key to killing algae is to SUSTAIN the high cl readings instead of letting them yo-yo up and down.

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