How can i tell the difference? Right now I am battling a nasty case of cloudy water and am a little nervous that if it is Mustard, I won't be bringing up the shock high enough. Currently with my 27k, CYA 50, I am shocking at 20-23 ppm since Saturday. Today was the first day in a looooong time that I have see the vacuum at the bottom of the deep end! Yay! But it is still very cloudy and around the top of the water line there is this yellow/ brownish crumbly scum line. When I roll it around in my fingers it turns into a little stringy ball. Also there are lots of beige areas all over the bottom of the pool that I can vacuum up if I go suuuupppper slow but if I move to fast it turns to cloudy dust......Does this sound like Mustard Algae or just pollen?