Brownwater is the mixture of Faeces and Flus water, and does not contain Urine.

It is generated by Urine-Diverting Flush Toilets (U.6) and, therefore, the volume depends on the volume of the Flushwater used. The pathogen and nutrient load of Faeces is not reduced, only diluted by the Flushwater.

Brownwater may also include Anal Cleansing Water (if water is used for cleansing) and/or Dry Cleansing Materials (see Figure).