How does a dry toilet work?

21.07.2019 18:00

More often than you think.

A toilet without flushing is used for various reasons. In so-called developing countries or in remote areas (also in Europe, Canada, USA, etc.), for example, because access to water is a big issue. But also in the garden, private and leisure areas nowadays more and more waterless toilets are used. However, they are not a must-have solution because households are usually connected to the local water supply network. Rather, dry-cleaning toilets convince more and more people from an ecological and financial point of view, without restricting the usual comfort of a conventional toilet.

Composting toilets that work without water also do so without harmful chemicals, such as those used in conventional camping toilets. In addition, the capacity compared to commercial cassette toilets is much higher.


Waterless toilets in which “leftovers” - urine, feces, but also toilet paper and additives, such as litter – are being returned to nature without any damage, for example, as a fertilizer, are usually referred to as biological dry composting toilets or composting toilets.

You should differentiate between two types: There are biological dry toilets, where the composting takes place outside, e.g. on the garden compost. And there are composting toilet facilities with a direct connection to a compost bin, which could also be inside the house.

In both variants, liquids and solids are separated, because only under these circumstances can  harmless composting take place. Dry composting toilets are normally no larger than a conventional toilet. The body contains two containers, one for urine and one for feces. Odors and moisture are kept inside the solid container by adding litter. Optimally, a bag is placed in the solid container for feces, which is 100% compostable. As long as urine and feces are not brought together, no bad odors arise. Due to the strict separation, both urine and feces can be composted. Urine tanks in a closed system can vary in size. Assuming a capacity of 10 liters and an average excretion of two liters of urine per day, a two-person household can use the dry composting toilet for about two and a half days without emptying the container.

The solid container in self- contained systems needs to be emptied much less frequently. Not only the enormous water savings and gained independence make the dry composting toilet so attractive. It also fulfills our ever-growing desire for ecological action in everyday life. We want to do our part: for environmental and nature conservation, and for the benefit of future generations.

Self-responsibility can be everyone’s responsibility – Kildwick´s systems make it easy for you. With sustainably and exemplary solutions for everyday use: whether at home or in your garden, whether on the road with your camper van or on your boat.

You can find more information about proper emptying, cleaning and care by reading our blog post "the right way to do it".