I really thought I'd gotten it...the last test results before I left town were taken on 7/10 rather than the 7/4 results I posted in yesterday's post. On 7/10 results were:
FC = 5
pH = 7.8
CYA = 60-70
TA = 90
and the water looked great. Previously, the algae would show up when FC got down to 8.
Sigh...I'll do the mustard algae shock routine...regular shock till FC loss is less than 1ppm overnight then move to mustard algae shock levels.
Thanks.