This sub-category is about composting toilets in general, except for those using wet composting or Arborloos (they have their own sub-categories)

An Arborloo is a simple kind of composting toilet for rural areas where composting takes place in a shallow pit below the toilet seat or squatting pan and leaves are added after each use.

This category is about the technical systems of "wet composting" where a digester, reactor or vessel receives inflows from flush toilets

This category is about composting various types of ‘wastes’ (e.g. sewage sludge, fecal sludge, organic solid waste) using worms