Quote Originally Posted by denanbob
We've noticed the same thing. We bought a used AGP and just got it all up and running yesterday. We put 4lbs. of DE into the skimmer slowly and about 2 hours later, DH vacuumed the pool and said he noticed the dust/silt/whatever and just thought it was DE. Later in the evening, our water looked super clear but if you stood beside the pool and looked down into it, you could see a ton of spots where there was a whitish/gray substance just settling where the wrinkles in the bottom were. I thought we had minimal wrinkles, but now I can clearly see there are alot!! I'll have him vacuum again tonight when he gets home hoping to get this stuff out of there! We have a 1hp pump and a Star DE-50 filter.
Denanbob. Are you using calcium hypoclorite to clorinate or shock by chance? I have a DE filter and thought the same as you. When I switched to bleach, no more grey "stuff" on the bottom of the pool!