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Fabrication of the filtration unit will utilize parts that are relatively inexpensive. The parts will also be locally available so that the operator can find and purchase newer parts for the filter when needed. Additionally, over-designing is better than under-designing: it is better to meet and exceed the needs of the users than to fail to meet the design requirements.
Design of Alum-Doser
Much of the focus of our design work has been on the alum doser. We propose three alternative designs for incorporating the alum doser into our system:
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Unfortunately, we realized that non of these proposed designs work well with our unit constraints. In order for the alum doser to dose the untreated water at an appropriate level using a mere "hole-in-the-bucket" situation, a bottom orifice of less than 3 mm is needed. These calculations can be seen in the [Alum Doser MathCAD file|A.