OK, I'm not sure how you are washing it, but here is what I have found:
If you get rough with it, it will create more dust.
When I washed my last 6 bags I used a 5 gallon paint strainer (thanks Rex, I wish I knew about this for the first 6) which is basically a giant nlylon mesh that can be found in most paint stores and your local Big home improvement place sometimes. Rinse it lightly to get the majority of the dust out (while keeping the fine particles). Put it in the tank, and then fill very, very, very slowly. Did I say very slowly? Putting a plate or a cup to prevent splashing will also help keep the fine particles down.
One new tid-bit that I've read, but haven't tried yet is to put down plastic wrap while filling. I'll have to give that a shot.
Also, if you have too much water flow it could be keeping the fine particles from settling.
HTH
Walter
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--May the floor under your tank always be dry, and your glass clear!!!