This case study presents different cost-effective on-site treatment technologies with main focus on hotel greywater and blackwater treatment systems. The first greywater treatment plant was constructed for the Swiss Residence Hotel. Based on the experience gained by the Swiss Residence Hotel, further systems were implemented at the hotels Ivy Banks and Coral Sands.MOREL, A. DIENER, S. (2006): Greywater treatment systems for hotel premises, Sri Lanka. In: MOREL, A. ; DIENER, S. ; (2006): Greywater Management in Low and Middle-Income Countries, Review of Different Treatment Systems for Households or Neighbourhoods. Duebendorf: 80-84.