Hoo ya Huntmaster just zipped through your build pond thread. That is the same clay I have here. This is some great stuff. I find even now I get that grey floating around after a rain. I am not sure what it is with the rain but I am thinking is chemical reaction. I can't keep a minnow trap in the pond or it will rust in three days. Brand new minnow trap will rust right away.

That clay is what gives it that nice blue colour as well. As the clay takes on more water in my case three years it will still go cloudy. Our grey clay has a PH of 8.5

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.