I've read that mustard algae tends to grow on walls and in the darker spots in the pool. I'm trying to figure out if I have an algae problem or just dirt. I live next to a golf course (in California) and the grass and trees are all blooming, so it could be pollen. Basically, the entire floor of my pool (but not the sides) has a fine yellow-green powder on the bottom. The powder appears to be uniform in depth. It brushes away easily, either by a brush or of the pool sweep, but it makes the pool very cloudy. After a day or two, the pool is clear again, but the powder is back on the floor, again uniform in depth. I have a SWG, but my chlorine levels dropped due to my inattentiveness. I shocked the pool yesterday and the man at the pool store said my "organics" were low.
Any ideas if I'm dealing with dirt/pollen or some sort of algae bloom?