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Due to uprating, decreasing the quality of the effluent filter and unstable backwash frequency on its unit filter per day result in the volatility of Karangpilang III water production quantity and quality. Two evaluations were conducted to determine the performance of the unit filter and its backwash process. The parameter used in the evaluation is turbidity. The first evaluation showed that (1) the turbidity of all units has complied with the national regulation. However, five units were found to not comply with the criteria from  PDAM ; (2) the ratio of backwash volume and water production indicated that the performance of filter number 5-10 was normal with a percentage between 3-7%; (3) only five units have fulfilled UFRV criteria being within the range of 300-500 m 3 /m 2 . Further assessment on filter numbers 2 and 10 was conducted using filter coring method. The loss of media, unstratified media, cracking, and air binging were seen on filter numbers 2 and 10. Based on the post-backwash turbidity value profile, removal and effluent turbidity of filter number 2 were better than filter number 10. Floc retention filter profile of filter number 10 showed different conditions in each sampling depth from 3 sampling points.

Filter performance evaluation of Karangpilang III drinking water treatment plant PDAM Surya Sembada Surabaya