I use the TSC flake, the fine has on occasion be sawdust, so I just stick with flake.

It doesn't have that strong smell of non-kiln dried, so I'm inclined to believe it is kiln dried.

I've been chastised and informed that TSC is not kiln dried because it doesn't say it on the bag and it will kill outright any rats I tried to keep on it. The hundreds of rats I've kept on it tend to say that person is full of poop. I'll believe the rats.