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The Computer Controlled Sedimentation Tank, "PDSC", is a teaching unit, designed by EDIBON, to demonstrate the sedimentation process and to familiarize with the settling principle of discrete particles settling into a tank. It will also allow to study the hydraulic characteristics of a rectangular sedimentation tank which works in continuous. As it is a laboratory unit, it allows to obtain valid conclusions about its operation and to apply them to the operation of a real scale unit. The great advantage of the "PDSC" unit is that its sedimentation tank is made of transparent material. So, this allows the student to understand the sedimentation principles. This fact allows to carry out several practices, as well as to make easier the comprehension of the different variables influence on the process. The practical exercises start preparing a suspension in the suspension tank, placed at the unit lower part. A computer controlled pump drives the suspension from the suspension tank to the sedimentation tank with a flow selected by using a computer controlled regulation valve and measured with a flow sensor. This suspension is mixed with clean water at the sedimentation tank inlet. The