Ok im a little confused about something...In my spare time, i try and read as much as I can on this forum to further educate myself, and really try and catch up on forums that have pertained to me..I just came across on where if you are trying to kill mustard algae, my levels need to be even higher than the cya/chart indicates for FC SHOCK LEVEL..Ive been targeting in the mid to upper 20's, but when I came across a diff chart for mustard algae, I should be in the mid to upper 30's according to my cya...Have ive been doing it incorrectly all week? I havnt been able to see how the pool looks today after removing stairs and massive clean...Still dark at 4:30am, but FC was 25...Added bleach anyways