I have a mustard algae problem that came back after a full "TFP approved" super chlorinating shock.
AND... I have two filters in the bottom of my pool that do not intake water. There's a missing part (I think) in my skimmer to divert suction to the bottom of the pool. I bought this house two months ago and am struggling to get the pool squared away.
I thought MAYBE there was a relation to my algae prob and the lack of intake on the bottom of the pool?
I did everything right AFAIK. Measured CYA and did mustard level shock to 24ppm for several days. Passed the overnight test w/ FAS-DPD. The algae came back once my FC hit around 6ppm.
I scrubbed the ever living out of my pool during super chlor, however, I did NOT remove my pool light to scrub. So maybe that bit me. OR, maybe my lack of intake on bottom of pool bit me. I do have a pool creepy crawler however, so water is being sucked from the bottom.
I do have high high PH levels in general and the total alk is high as well (southern calfornia). Maybe that doesn't help either.
Anyways, i appreciate this forum immensely and have learned a ton in the last 2 months.