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Figure 2 demonstrates the comparative results of residual turbidity with floc breakup and without floc breakup. Obviously, the residual turbidity is lower after floc breakup device was installed. At the alum dose 4, 4.6 and 5.2 mg/L, the difference of residual turbidity between the 2 groups of data reaches 10 NTU. Both curve seems to fit into the logarithmic trend line. The results indicate that our hypothesis "large flocs are useless" may be correct and offers insight into improving AguaClara's current flocculator design. Image Removed Image Added

                                                       Figure 2  Comparative  results of residual turbidity vs. alum dose  

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