This is my third season with my pool. First full season with BBB.
I keep thinking I'm getting things where they need to be, and then the clarity lessens, a greenish tinge starts to appear, and then I'm brushing up brownish-yellow clouds.
Weekend before the 4th, things just started appearing this way. I shocked, did the Overnight test, brought things up to Mustard Shock level, and by the 4th, it was swimmable and looking rather nice. 2 days later, and the pool was the picture of perfection. Two days ago, the clarity lessened, and yesterday it started getting green. I shocked last night, it didn't appear to lose any Chlorine overnight, but this morning I definitely saw yellow on the side and edge of a step (letting me know that I am dealing with MA and not pollen.
What could I be doing wrong? There are no lights in the pool. The only fixture is the removable ladder.
Here is where I have been keeping my numbers:
I had been keeping my pH at 7.5, but lowered it towards the end of the last shock, based on the theory of more effective chlorine available. Bringing it down (I know the pH reading is not reliable at higher CC) helped clear things up, and keeping it there it was more beautiful than it has ever been.
And now here we are.
The only factors I can think of (and I'm not sure if they are causal or coincidence) is it SEEMS to happen after backwashing and higher ambient temps (upper 80s the last few days).
Thanks so much!