I had a terrible problem with brown/green algae. After using Leslie's "Green to Clean" the pool was still cloudy. The rep at Leslie's suggested that I use Alum. I tried the Alum almost 3 weeks ago and cannot get it out of the pool. I continually have white powder at the bottom of the pool that I cannot vacuum away. Also, my filter continues to push "white water" that leaves a white foam on the top of the pool. I cannot seem to get rid of this with vacuuming to waste, backwashing, rinsing, etc.
I am about to take the filter apart, put in new sand and see if that helps.