Yeah, I was just about to ask you if I should use a higher level for FC. No, they are algae (I think we have less pollen currently). Every time I brush they come out of the walls a bit by bit and get caught in the secondary skimmer after few hours(fine mesh) and the pressure of the filter rises +5 within next day or so. I backwashed the filter 4 times this week itself. The algae on the walls are not turning brown at all. They are still black and looks dark green when caught in skimmer mesh. To make matters worse I have a popup cleaning system (caretaker) which doesnt work well under high filter pressure. I have to maintain the sweet spot of 28-30psi or else they dont rotate, I think there is something I am unable to understand what to do.
I swim during the weekend, looks like good weather for this weekend, may be we will use it this weekend and start on the +shock+ levels. I will check CYA again tonight if its wrong. Thanks BigDave.