Yes,
Get the Cya to 30 and start a SLAM. As soon as you put the Cya into a sock and hang it in front of a return, or put the sock in the skimmer you are good to get with the first boost to SLAM level. Keep squeezing the sock from time to time until it all dissolves and assume it is there. No need to test for it unless you change out a whole lot of water. If you start with a good pH (7.3-7.5 for SLAM) you don't need to test for it either until you are done. The pH will be skewed by high FC, so it isn't a good number with FC over 10.0 anyway.
Get the Cya to 30 and start a SLAM. As soon as you put the Cya into a sock and hang it in front of a return, or put the sock in the skimmer you are good to get with the first boost to SLAM level. Keep squeezing the sock from time to time until it all dissolves and assume it is there. No need to test for it unless you change out a whole lot of water. If you start with a good pH (7.3-7.5 for SLAM) you don't need to test for it either until you are done. The pH will be skewed by high FC, so it isn't a good number with FC over 10.0 anyway.