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Solution of the week 6

No change in size, 00:08, 19 May 2015

→‎The Siphon filter

====The Siphon filter====

So — $30, $20, can we go lower? Enter the [[Siphon_filter|siphon filter]]. Produced by Basic Water Needs Foundation India, and sold under the brand name Tulip filter and CrystalPur, it is sold for $10$. To reach that price point, the filter has been designed in such a way that only the most essential elements remain: a filter element, a tube, a tap. That’s it.

The ceramic filter element is made out of [http://en.wikipedia.org/wiki/Diatomaceous_earth diatomaceous earth], a wonderful substance consisting of the fossilized remains of diatoms, a type of hard-shelled algae. Their beautiful little skeletons contain extremely small holes, which are very suitable to act as a bacterial filter. The filters are impregnated with silver particles, which reduce regrowth of bacteria. Although bacteria are filtered effectively, candle-type ceramic filters have lower removal efficiency for viruses. To effectively remove these, ceramic filter filtration needs to be combined with a disinfectant such as chlorine.

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