Haha. I guess I should have washed this stuff out...I was getting anxious to get the tank running. I thought I was ready to roll, that is until I found out that my wife wasn't going to let me pump water all night (yeah I've had a couple mini-floods...). So had I known that I probably would have taken the time to wash it out, since I would have to wait a few days to get it filled anyways.
Anyways, I fired up the MP60 last night and it disturbed all those fines, making the water very cloudy, it also uncovered a dead hobo that was buried in the sand....OK it's not THAT bad.
The tank is almost filled, I have two 100 micron filter socks ready to filter out all of the fine particles and half-eaten sandwiches. Hopefully these do their job and clean up the water in a day or two.
By the way, the MP60 is crazy, the undertow was slowly moving sand from one side of the tank to the other, it wasn't sucking any up, though.