You NEED to get a good drop based test (Taylor k2006 is a fav here) or get water tested at pool place....but DONT BUY ANYTHING FROM THEM.Also shocking to 5 ppm is doing nothing more than casting you more money than need be.Load up on Liquid chlorine or bleach and shock to 15ppm as previously stated and keep it there by testing daily several times a day and adding chlorine as necessary to keep it at 20 ppm.You always be behind the algae by shocking to 5 ppm instaed of in front of it.

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