I have tried to vacuum, put algaecide, more shock nothing makes it go away. I have drained the pool what ever this stuff is it even made the dirt turn white. I am going to scrub the sides of the pool tomorrow but am afraid this stuff will come back, any one know what this is and what I can do to insure it does not come back. I originally had a hazy pool then white powdery stuff was at the bottom of the pool.... I really need help.