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The Flow Controller device is used to maintain a constant level of water in a source, a constant head tank, which is refilled by a stock tank. By adjusting the constant head tank, different flow rates of Alum may be sent to the plant for the flocculation process. Field use of this device, however, is consistently inaccurate, diverging in direction relation to flow rate as well as tubing length. However, the majority of the data seems to indicate that there are in fact more confounding variables which make flow predictions nearly impossible. This dependence on faulty information, namely the inapplicable equations, may cause miss-dosing in the plant or a wasteful situation of using too much Alum for the plant.

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