Strangely enough, I have just acquired a few bags of the same stuff after some local trees were trimmed to accomodate power lines.
I thought about various uses for them, then decided to keep them for winter overnight damping of the fire.
My chimney went up the other day as well, must be the time of year after winter fires, and I saw flames leaping about 12 inches out of the top of the chimney pot at one point. With two young children in the house, and fierce winds outside, I was worried for a while...........