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This presented a new challenge of verifying whether the hypothesized plate settler theory was true for different brands (having different particle size distributions and different composition)of lime or if the unexpected results of the experiment was due to some impurities present in the distilled water supply system. (A much higher performance for the lime feeder had been expected - much greater than 4 hours but less than 14 hours;4 hrs being the duration obtained using tap water and 14 hrs being the theoretical run length with the given amount of lime and given water flow rate.)
Figure 1. pH vs Time (h)
CONCLUSIONS
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