I often get algae in a few places in my pool. On a grotto shelf, another step into the pool which is near the spa spillover and a few places on walls. Nothing drastic however it is annoying. I brush and keep the chemicals ok, however it seems to come back after only a day or two.

Water temp has been around 74 and rising, I have chlorine right now at 9 PPM seeing if that will help but normally I run at 3-5 PPM, CYA is about 40. I have a cartridge filter and navigator sweep which can get most of the walls but obviously not the steps or shelfs.

Would polyquat help with that ? Or is it mainly to prevent a full out algae bloom ? Is there anything I can do to prevent this from coming back other than brushing every day ?

thanks,
-- john