Why? We’re in drought, so we don’t have water to flush toilets. The nutrients in shit should be re-used, and that is difficult when we dilute it with loads of water and mix it with god knows what else to be shipped off somewhere to be so-called ‘treated’. Also, flushing toilets mean we are flushing nutrients into receiving water bodies (even with excellent wastewater treatment, we’re still not doing well enough). So flushing is just a stupid idea. More about this in a presentation (pdf, 5MB) I recently gave.
If you don’t know already, I have a dry toilet. I love my dry toilet. It’s indoors, I’m affluent, privileged. This is not about toilets for poor people. This is about dry toilets for everyone.
But, many people don’t like the idea of looking at their shit, so we’re trying to get the experience of the white ceramic sparkly-clean ‘flush and forget’ ‘out of sigh(t) out of mind’ toilet, with the cost-saving benefits and environment and resource recovery goodness of dry toilets. I think currently the foam flush may be our best bet.