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The Predictive model is supposed to be updated based on the experimental data after floc breakup device was installed. An approach to develop this update existing model is to insert trend line to our existing experimental data and pick the best relationship for turbidity removal versus alum dose curve. Next we need to check how variables are changed after installation of floc breakup. Figure 3 indicates that the logarithmic type fits the data the best with a regression equation of y = 0.2062x -0.0078 and a relation coefficient of 0.9931. 

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