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Old 10-11-08, 09:48 PM   #21
Conradpdx
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Sand filters are often used to decontaminate the water from rain water collection. Basically its a layer of gravel and a lot of sand. Bacteria and micro-organisms live in the sand that eat all the junk in the rain water. They do need to be cleaned every now and then though, but if I remember right it's basically purge, stir and rinse.

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