I assume you are referring to this chart Pool School - Chlorine / CYA Chart So take your "assumed" cya level based on your addition of CYA several days ago, and follow the chart for the shock level target of Free chlorine. Make sure your PH is good to go as well before you start SLAM
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Also if you have a SWG--(You don't say in your signature) turn it off during SLAM Process.
No. Just assume you are at your CYA target. But, the liquid cya should show on the test in a day or so.
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Also if you have a SWG--(You don't say in your signature) turn it off during SLAM Process.