Changes

When faeces are not mixed with urine and other liquids, they dry quickly. In the absence of moisture, organisms cannot grow, pathogens are destroyed and smells minimized. The use of two alternating vaults allows the faeces to dehydrate in one vault while the other vault fills. When one vault is full, the [[Urine Diverting Dry Toilet | Urine-Diverting Dry Toilet]] (UDDT, U.2) is moved to the second vault. While the second vault fills up, the faeces in the first vault dry and decrease in volume. When the second vault is full, the first one is emptied and put back into service. To prevent flies, minimize odours and encourage drying, a small amount of ash, lime, dry soil or sawdust should be used to cover faeces after each use.