This is a topic I'm very interested in as I'm on day 4 of new plaster. I have read here several times not to worry about CH and TA as they will rise on their own, then adjust them after a few weeks. I'm wondering if raising the CH to 200 is a good idea as onBalance suggests. I didn't acid wash and it seems that the hard troweling was done well. I do think most of the same plaster dust gets swept around over and over. It seems to settle right away. I've backwashed twice.