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<http://webisa.webdatacommons.org/241408349>	<http://www.w3.org/ns/prov#value>	"Join Date Oct 2003 Location Houston Posts 140 Originally posted by iceNine This site seems available on an unpredictable basis but it is a filter study done by an engineer where he cut the filters open and examines the build quality and other parameters." .
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