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Sample holding tank costs: Ace/DenHartog 55 Gallon Vertical NSF-61 Tank: $75.99
http://www.tank-depot.com/productdetails.aspx?part=A-VT0055-20 Image Modified
Figure 1: Schematic of inlet with a holding tankFor cases 1, 3, 3.5 and 4:
Because there is no holding tank, the primary costs will come from the alum doser and the actual filter apparatus.

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