I have what appears to be mustard algae in certain places on the pool walls, in the shaded areas. When I brush, it just dissipates, but returns a day or two later. Meanwhile, water looks crystal clear and test numbers are good. I've read the info here about mustard algae, and I understand that first a normal SLAM is needed. My question is, do I need to backwash during a normal SLAM if water is clear and CC is 0? Should I wait to backwash until after I'm at MA shock level, or even wait until after that?
We're going to be disassembling and cleaning our DE filter later this month before we start using the pool again, so I'm trying to figure out the best time to do the MA shock.