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The flow of water through the model becomes increasingly restricted over each run. The model finally clogs on October 18, 2008. When clogged, the the stock tank and constant head tank are still full with solution, which indicates that the closure is in the line below the constant head tank. We believe that it is clogged at the t-joint, because of the parts within the t-joint, however the closure may also be at the valve. The closure may be at the valve because of the fact that it isn't fully opened.
Goals
The next steps here are to figure out where the clog occurred. We can do this by isolating the sections at which we believe may be clogged. The next step will be to perform the experiment with a new method of preparing the solution (filtering it, settling for longer, etc) and recognizing whether or not it takes longer to restrict the flow rate. Another step would be to analyze the pH readings of the runs and to determine whether altering the alkalinity (adding acid) will stop the model from clogging.