Help me out

You should drain no more than 1/3, or if your pool is rectangular with deep end, you can go as far as leaving 1 ft of water in your shallow end. Honestly, I'd go with the 1/3.

You should be out with the pool the entire time you are draining, It might take 30 min, or could take longer, depends on your pump.
 
So, I just tested the CYA outside, and it shows just over 70. I guess the difference is I was checking it inside this morning in a low light situation, vs the test just now outside in the light of day. So I guess i still need to drain some, but not quite as much. Will I have to start SLAMming it immediately after refilling, or can it wait a day or two?
 
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