Original rapid sand filter of Zhitan first facility has been operated for more than 30 years. Low performance of filter has affected backwash efficiency and production stability, and cut down purification capacity. The goal of the construction project was to improve capacity of the rapid sand filter.
　　Design capacity of the project is 500,000 CMD. The construction project is expected to increase water supply stability in Taipei metropolitan region and prolong system lifetime. Operation electricity and backwash water use are expected to drop significantly since longer filtration run and higher backwash efficiency. This construction project was awarded “Distinguished Public Construction award” by Taipei city government.