I just started the BBB method in July with 100% new water after a new liner, 30k gal pool, vinyl liner.
Everything went great for 2mos, my numbers were always as follows:
FC: 3 to 5 (generally averaging between those but usually 3ish, maybe a dip here or there for a day to 2)
PH: 7.4 to 7.6
I followed everything perfectly, using trichlor to get my cya up to 30-40 and then switching to 100% bleach, adding approx 3qts of 6% bleach a day.
I haven't done any shocking because my #'s were fine so as I understood this wasn't' needed, also didnt use any polyquat.
All of a sudden I see about a hundred or so dreaded light brown "spots" in the deep end. What went wrong here? A little history, prior to the new liner I always battled algae but thought it was due to my incorrect understanding of CYA and it was prob through the roof... now I had everything perfect and algae again!!! I'm at a loss now..