Waterless UD toilets look similar to a typical toilet, but feature two sections: a bowl that captures the urine and funnels it to a storage tank, and a separate section has a large hole or chute, which allows solids (feces and paper) to fall through into the bio-chamber.
Once in the bio-chamber, the solids decompose and turn into humus soil conditioner or compost, which looks and smells like soil. (See Composting Toilet Systems)
There are several waterless UD toilets on the market:
- EcoDry Urine-Diverting Toilet made by Wostman has an optional flush, which uses less than 1 cup of water to flush urine into a storage tank.
- Camp-style waterless UD toilets on the market for the DIY market
- The Separett UD/Composting Toilet