This is certainly one of our most frequently asked questions and put simply, the answer is ‘no’. There is absolutely no odour in the room a well-functioning composting toilet. A composting toilet actually produces less smell than a normal flushing toilet and this is thanks to their clever yet simple design. The aerobic conditions of a composting promote the growth of healthy, aerobic microbes and the ventilation system draws any odours down the toilet pedestal, through the composting chamber, providing oxygen to the composting microbes on the way, and then out through external vent pipe. For more information on the ventilation system of a composting toilet – see this video.