Pool is clear but bottom looks spotty and dirty

[rkrgk]

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.

[BigDave]

Wear an old swimsuit and have fun!
It's going to be a while for us - the pool made it up to 60 yesterday.

[rkrgk]

Here it is 101 today!

I have been continuously putting bleach and brushing the pool everyday for the past two weeks, maintaining atleast 15ppm of FC, I am starting to up the chlorine to 30 since I think its not that easy to get rid of them. The black spots are almost like plaster. Is there any thing else I can do to make it easier to shake them out and remove them? I am able to get rid of them, but only little by little and not sure if I can remove them completely. Its harder to remove them in the deeper part and under the water fall where it is hard to reach. Can I somehow brush them off with some concentrated chlorine or something?

[rkrgk]

I read in some other posts about using polyquat. Is that effective to remove black algae easily from the walls? Seems like I may be just losing the battle against the algae although I made huge progress, still algae is not completely removed even though I brushed the same place a 100 times, they are so stubborn. Unfortunately I was sick for few days and still recovering.. so physically I may not be able to do much brushing for couple of days as well.

[BigDave]

Polyquat (the only algecide recommended here) is better at preventing algae than killing it. It also creates a chlorine demand when added to the pool. The best advice I can give is to maintain the +shock+ FC levels. Perhaps somone else will chime in with another idea.

I glad to hear you're making progress - don't give up.
I hope you feel better soon.