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As of currently, we are re-considerig the use of a float value to monitor the surface level of the alum solution. This should make dosing less variable and may help find a better solution to the orifice problem. Originally, we eliminated this design because we did not want to include small, hard-to-fabricate components into the design. Yet, this seems like the only potentially successful option at the moment. Also, we are looking into the addition of a flocculation component.
Add more info. about new MathCAD file and current final design of the point-of-use unit. Comment on how we omitted the alum doser and chlorine doser in the design (and how we will use "batch" system instead). Maybe show a schematic of the new, final design below.