Grey water is grease and excrement free sewage which results from washing. This is collected and processed during grey water utilisation so that it can reused as industrial water for flushing toilets or garden irrigation.

The individual processing phases are:

· pre-filtration
· 2 fold biological cleaning
· disinfection/UV hygeinisation
· agitation (pump)
· automatic drinking water replenishment
(only where necessary)
· backflushing
· sediment removal