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	<title>protozoa &#8211; MetaEfficient</title>
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		<title>Slow Sand Filters</title>
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					<comments>https://metaefficient.com/water-filters/slow-sand-filters.html#comments</comments>
		
		<dc:creator><![CDATA[Justin Thomas]]></dc:creator>
		<pubDate>Thu, 20 Jan 2005 14:30:32 +0000</pubDate>
				<category><![CDATA[Water Filters]]></category>
		<category><![CDATA[annelid worms]]></category>
		<category><![CDATA[aquatic organisms]]></category>
		<category><![CDATA[clean drinking water]]></category>
		<category><![CDATA[drinking]]></category>
		<category><![CDATA[insect larvae]]></category>
		<category><![CDATA[layer]]></category>
		<category><![CDATA[protozoa]]></category>
		<category><![CDATA[Slow]]></category>
		<category><![CDATA[slow sand filter]]></category>
		<category><![CDATA[water]]></category>
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					<description><![CDATA[Slow sand filters are perhaps the most efficient means of producing clean drinking water. Slow sand filters rely on biological processes for their action rather than physical filtration or disinfection. They require no electricity, no chemicals and no filter changes. How is this possible? The secret is that slow sand filters work through the formation [&#8230;]]]></description>
		
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