...
Based on our caculation, the longer tube can capture smaller size particles(The relation are shown in the graph below), the tube length at 1.5m has a capture velocity of 10m/day,and the smallest particel it could capture is 0.00135mm. Lime particles will have a larger density than the flocs, which means their settling velocities will be higher than the assumed 10m/day. Also, it is not necesary that ALL lime particles settle down - some amount (not determined yet) will have to fall out of the lime feeder to solve the acidity problem. Consequently, the length of the tube needed will be lower than 1.5m.
...
For this trial, distilled water will be used instead of tap water. In the picture below (figure 4), the ANC Control team can be seen carrying the distilled water tank on to the platform where the experiment is to be set up.
, 
