Page History

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Sample design and cost analysis

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Family unit (probably approximately 7-10 people), have a tap, household use (drinking, cooking, cleaning, etc)

Because there is a tap, there would not be a need for a large holding tank since the tap can send the water directly into the filter. To control the flow of water through the filter, there will be a float valve on the top of the filter to maintain a constant level of water; this is important to maintain a height of water to maintain constant flow.

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Family unit, don't have a tap, must pour water into holding tank, only filtering water for drinking and cooking, not cleaning

When the family unit does not have a tap, we will need to have a storage tank to hold the water. The water flows into the filter much like a tap water source. Again, there will be a float valve in the filter to maintain a constant level of water.

Sample holding tank cost: $34 for a 15 gallon tank from Baytec Containers

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Apartment building size (approximately 50 people), tap, all uses

Again, since there is a tap, there would not be a need for a storage tank; the tap connects directly to the filter.

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Business or school, have tap, not all uses- just cooking and drinking water, cleaning (but not showering)

No holding tank is needed.

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Small village, no tap, bringing filter directly to river where individuals dump buckets of water into holding tank, only filtering water for drinking and cooking

Here, a large holding tank will be needed. Villagers will bring buckets of water to the holding tank where it will be filtered for the purposes of drinking and cooking, not cleaning. Because the water will not be used for sanitation and hygiene, we assumed the water consumption to be close to the absolute minimum for drinking water (approximately 5L per person per day).

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 Removed}
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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