Quote Originally Posted by JohnInSoCal
Are you sure you have a mustard algae problem ? My mustard algae would come back the next day or two but never a couple hours later, that sounds like perhaps you have DE or dead algae in the pool. My mustard algae returned on the sides of the pool in certain spots and on a grotto shelf. I finally got rid of it by getting FC up to 25 ppm and using polyquat 60.

What kind of filter do you have ?
Based on what it looked like, it was mustard algae. I have a sand filter- less than 1 year old. It looked like tan colored dirt. It would just poof away when you moved your hand near it. When I looked at it close, it was sorta slimy looking. Anyway based on web searches, it met the mustard criteria. I may try poly 60 in a few days just to see what happened. It's not dead, I believe, because I vacummed to waste and the next morning, it looked the same in teh same places- along the creases in the liner. My water has never gotten green either????