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Unfortunately, we realized that both the "Series of Orifices" and "PVC Cap as Orifice" designs do not generate enough head loss to dose with small amounts. Also, in order for the the "Spiral Tubing" design to successfully work, a extra tubing length of around 3.5 meters is needed; this is not feasible considering our desire to have a small overall filtration unit. Therefore, we needed to look into other viable options for the design of the alum doser (which will be a model for the required chlorine doser as well).
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