Anyone try a biochar toilet?

Instead of sawdust?  If so, results?  Odor?

Not completely, but a little charcoal mixed in with the sawdust does a good job of controlling odors.

I used fresh ash/char from my firepit in an old pit outhouse. It worked very well at controlling odours.

Edit: I also use fresh char in my "liquid gold" collecting jug. Again, excellent odour control. A little dry ash in the mix is fine. I believe it raises the pH so high that the normal smell-making decomposers aren't active.

Ellendra Nauriel wrote:Not completely, but a little charcoal mixed in with the sawdust does a good job of controlling odors.

I did the same in mine.  I mixed maybe 10% in with sawdust and I found it to work well.