I have a lot of experience with composting toilets. I went to an outdoor classroom school for three years. After a couple of months of wading into snowbanks to piss and shit we decided to build a composting outhouse. Basically, you do your business and add a handful of pete moss, vegtable matter or ash into the hole and turn a little crank. When the barrell underneath filled up we'd close it off and set it in the barn for...eh...maybe six months. Deposit some good earthworms in there if we could find them and leave it for another four months or so then BAM! Beautiful compost. We grew awesome veggies in our garden with it. The soil was tested by some manner of health inspector and was very clean and healthy. An important aspect of this process though, is controlling moisture content.
Also, my family cabin is equipped with one. While the compost it produces neither smells nor looks offensive we don't use it for gardening because we don't balance the moisture or give the pathogens much time to die.
Also, I have tried the dark ages method of washing clothes in urine and lye. NOT worth it. Yeah, it got the grease out after a couple cycles and actually lightened whites but the smell was awful.
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