after reading up on this awesome thread for several months, I started the switch yesterday at 4pm
some info: pool is 15000 above ground sand filter
first color after nine 182oz 6% bleach, was a nice dark brown, went to second job and at 11pm added another 5 bottles of bleach, color was brown/green
at 7am it was dark pea soup, added another 9 bottles
checked numbers, added another 3 bottles, and currently the color is light pea soup.
once the conversion is complete I will be using BBB.
one question, it was supposed to be sunny all day, it is overcast with lite drizzle, will this be negative to the conversion? I figure that less sun is good and will make it quicker.