Cellulose Assisted Dewatering of Sludge (CADoS) is based upon harvesting cellulose fibres (from toilet paper) with a fine screen from municipal waste water for dewatering of biological sludge. The fibres serve as a filter aid for dewatering of biological sludge resulting is less costs for chemicals and sludge transport. The CADoS principle is applied in the Netherlands and this app shows an example of an full scale installation.