I have been fighting what I originally thought was mustard algae on the bottom of my pool but am now pretty sure is just fine dirt/dust/pollen. I have been vacuuming every other day now it seems and less than a day after vacuuming, brown dust spots have returned to numerous places all over the pool bottom(usually in the pits and dips of the bottom) I have NEVER had anything show up on the walls, its always on the bottom and is easily swooped into a brown cloud if you run your foot or something over an area of spots. My vacuum connects to the filter system so I know this **** is being sent into the filter, but it seems like it manages to cycle its way right back out into the pool. My sand filter is only a year old and I have tried backwashing right after vacumming but still having same results. Shouldn't the sand filter be taking care of this brown "dust"?
I have ordered a pool rover jr. which will be here next week and am hoping that it will help to remove the dust/dirt from the pool system.