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Iron filter

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[[Image:iron filter.jpg|thumb|right|250px|Building an iron filter. <br>Photo: PCWS]]

The iron removal filter (IRF) is a cylinder built using ferrocement construction techniques. Inside, from top to bottom order, is a plastic basin full of charcoal, a layer of gravel, and an empty space for sedimentation. The water to be treated (in this model the water is assumed to be from a hand pump spout) first passes through the charcoal, aerating it, flows to the empty pace space at the bottom via a pipe where sedimentation of the precipitated iron takes place, then wells up through the gravel for filtration purposes. The finished water accumulates above the gravel filter, and this elevation enables users to draw it.

==Construction, operations, and maintenance==

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