Brief history: last week I had to SLAM my saltwater pool. One day I noticed sediment on the bottom, and thought it was dirt and pollen. The stuff would brush up in a yellowish green puff, and disappear. The next day the pool was cloudy and became increasingly yellow/green as the day went on. I raised FC to 24 and held it there for during the day/evening, and it passed the OCLT that night. In the morning I vacuumed the dead algae, and the water looked perfect! I let FC slowly drift down for the next couple of days, then turned on the SWG and held FC at 8. FC has been in the range of 6 to 8 every time I've checked with my DPD test. CYA is 55. Water has been beautiful for several days.
This morning, the sediment is back. Not much, but enough to notice. It behaves the same as it did when I noticed it last week - brushes around in a yellow/greenish puff and disappears. I've read about mustard algae but I also know it's not common. I want to know what is causing this stuff to come back, after a successful SLAM and maintaining proper FC. Do I need to go ahead and SLAM again now to stop it before it takes hold again? Or could it just be dirt?
CYA 50 - 55 (planning to raise to 60 but want wait until after a SLAM if it's required again)