Once you know your CYA level, you need to keep your chlorine between the minimum and maximum value listed in the Best Guess Chlorine Chart. And, if you have an algae bloom, the shock level needed to kill it is also based on your CYA level.
The 5 in 1 kit cannot test for CYA. Also, that kit can only measure chlorine levels up to 5ppm. The Taylor K-2006 or 2006C (better buy), gives you the ability to test higher chlorine levels. Do yourself a favor and go ahead and order it. You won't be sorry.
Welcome to the Pool Forum, by the way!
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