Hi,

Had this algae the end of last year. It never really left. Opened the pool this year and the fun begins again.

Currently my pool is:

CYA 100
pH 7.3
TA 110
FC- 2 days ago I shocked it to 27. Today it was 21.5 . I just now shocked it to 37 hoping that will kill whatever kind of algae it is.

Any idea what kind of algae it is? I brushed it and nothing happened to it
I appreciate any advice you experts can supply!!!

Incidentally, I use the BBB method

Here are some pictures of the problem: