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The optimum flow rate which could keep the lime suspended without excessive lime coming out (as observed visually) was found to be about 85ml/min. (What is this in terms of an upflow velocity?)
The figure below (Refer to as figure 2, not figure below) shows the apparatus used for the first trial, it consists of a glass column connected with a water source regulated by a peristaltic pump. The lime was added manually from the top.
(This paragraph seems to be a little out of place after the results. It seems to belong with the procedure)
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Figure 2: Experimental Apparatus