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The sample cell was used for Tube Flocculation Research in spring of 2007 was tested for its flush time.  The sample cell was connected to a peristaltic pump and UV-Vis spectrophotometer in the Environmental Teaching Lab in order to continuously measure the effluent of the turbidimeter cell. Red dye #40 was injected into the influent line in a pulse at four different concentrations: 0, 10, 20, 40 mg/L. Before the measurement using the spectrophotometer, a Spectrophotometer is used to measure the light intensity. Based on the light absorption level of the sample at different wavelengths, we are to measure the concentration level of a certain fluid with respect to a standard. A set of standard for various concentrations was created . The purpose of this was to create data points for the program so that it can interpolate the test result using the same standard set. This step is done by pumping red dye solution at different concentration into the sampling cell. After the preparation, we start running the test and collecting data. First, we open the red dye container while close the water container and turn on the pump. Thus, the red dye solution will be pump through the pipe and eventually fill up the tube. Then, we close the red dye valve and open the water valve at the same time as we collect data. As the cleaning begins, the water will flow into the tube, mixes with the red dye inside the tube and then outflow to the waste. The data will be collected near the exit of the outflow.

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