adjust cya before or after shocking

[Kateyru]

Yes, liner is blue. as i said on other thread, algae seems to disappear in the direct sun tho I think there is almost always a yellowish band of ??? algae (or a stain) where the wall and floor meet in several areas around the pool...if that makes sense. I have a ladder, not sure if it's removable as I've never tried to take it out. I have 1 pool light. How do I identify areas of poor water circulation? I'm fairly sure it's algae and not pollen.
Just read section on mustard algae, and I think you're absolutely right...that's the problem! No wonder my efforts were not enough. Sounds like a major production to get rid of mustard algae.
Many, many thanks!!!