Greywater, also known as sullage, is domestic wastewater generated in homes or office buildings from faeces-free streams, i.e. all streams except toilet wastewater. Greywater is produced by sinks, showers, baths, washing machines, and dishwashers. Because it contains fewer pathogens than domestic wastewater, greywater is usually safer to handle and easier to treat and reuse onsite for toilet flushing, landscape or crop irrigation, and other non-potable uses. Pathogens from soiled clothing or cleaning the anal area in the shower or bath may still be present in greywater. Reusing wastewater is a critical component of long-term water resource management. Greywater can be an important alternative water source, particularly in arid and touristic areas where water demand is highest during the dry season