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[Tvoivozhd <tvoivozd AT infionline.net>]

If you use a spring for your water supply, it is a good idea to use a 
sand prefilter to take out mud, maybe crawdads, pollywogs, 
killer-whales.  If there is risk of giardia or coliform bacteria, 
install a separate valve plenum and commercial activated-carbon 
cartridges in your drinking water faucet.  Here is a schematic of the 
pipes and valves for a three-tank sand filter.

Sand Filter Piping 
<http://www.mermade.com/sandfilters/sand_filter_piping.htm>