Amelia, I love your setup! Do you fill the bin from inside, or does it also open to an outdoor source of sawdust?
As far as this thread is concerned, I have a somewhat related question... My husband and I are eagerly planning to use a "bucket toilet" and to remove the whole concept of black water from our lives. Then I remembered that I would like to use cloth diapers for our children...this complicates things a bit. Does anyone here have any good suggestions for dealing with a minimal amount of black water for cleaning baby things only? We are still in the design phase of our house, so any suggestions as to how to incorporate this would be appreciated! At least for a while, we will likely be using a pair of galvanized wash/rinse tubs which could be "easily" diverted to a seperate drainage location when needed.