What causes cloudiness and powder like formation in a swimming pool if the powder is a greenish brown color?

If you are refering to a white cloudiness, There are two reasons for this one is not enough sanitizer or chlorine it should be between 2.0-5.0. The other is poor circulation either your filter is dirty or worn out and not filtering enough. A commercial pool or multi family pool needs to circulate 24-7. A residential pool should circulate at least 8 hours a day in order to keep water healthy.The powder is formed from Alkalinity being to high. Alkalinity should be between 80-120 ppm and PH maintained around 7.2-7.6 ppm. Take a sample to your local pool dealer and they will tell you how to fix it.It is important to know how many gallons is in your pool Lengthxwidthxavg.depthx8 Kenny Kummer E.M. Systems