He states in his first post that he is going to use dichlor for awhile which will give him the needed CYA. (I had to go back and reread to find that info as well because I, too, had forgotten his plan.)

Regarding baking soda additions --- each half pound will add about 10ppm to your alk. Don't try to get to your target with one big dose. Do several small ones instead waiting a few hours between additons. I'd probably add a lb. at a time.

Dave --- I bet you're right about the gray sail thing. Makes sense.