And yet this problem has already been solved with composting toilets for many years.<p>Why do we need to build such a fancy and complicated device when all you need is to pee in a separate bucket from your poo, and let the poo aerate&#x2F;dry naturally? Mix in some dry mulch and you&#x27;re done!<p>Urine itself is sterile and can be easily treated&#x2F;recycled.