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T he application o f a combined UF and RO t reatment for the reuse o f spent filter backwash f rom treated swimming pool water is a suitable a nd environmentally friendly method for the r euse of water in swimming pools. Based on a f ull-scale study, membrane performance and the e ffects o f SFBW reuse on pool water quality and w astewater disposal were investigated. U F treatment of SFBW offers many advant ages. High-quality filtrates can be easily returned to the swimming pools without any safety conc ems. The results of this study indicated an a lmost complete removal o f particulate matter d ue to UF treatment. Caused by high water tempe ratures, high fluxes can be achieved, resulting in a n excellent membrane performance. Chemical R eferences [1] T. K6tzle, G. Merkl and P.A. Wilderer, Large scale reuse of different filter backwash waters applying a submerged rnicrofiltration membrane system. Proc. Management of Wastes from Drinking Water Treatment, London, 2002. [2] F.G. ReiBmann, H. Wingrich, and P. Krebs, The behavior of inorganic and organiccompoundsduring ultrafiltration treatment of spent filter backwash water. Water and EnvironmentalManagementSeries (WEMS), in press. [3] F.G.Reil3marm,M. Scherer, M. Weig and H. Wingrich, Cost-efficiency of ultrafiltration treatment for the reuse of filter backwash water - - a case study. Proc. Membranes in Drinking and Industrial Water Production, Miihlheim, Germany, 2002.