Changes

|实验室lab:细菌bacteria=>98-100 % <ref name=Lantagne>[[#Lantagne01|Lantagne]] (2001)</ref><ref name=Smith>[[#Smith04|Smith]] (2004)</ref>|实验室lab:病毒viruses=19-99% <ref name=Lantagne/> <ref name=Halem>[[#Halem06|Van Halem]] (2006)</ref><ref name=additives>Some additives to the clay may increase virus removal. </ref>|实验室lab:原生物protozoa= 达到 100% <ref name=helminth/>|实验室lab:蠕虫helminths=达到 100% <ref name=helminth> Not researched, however helminths and protazoa are too large to pass between the 0.6-3 μm pores. Therefore, up to 100% removal efficiency can be assumed.</ref>|实验室lab:浑浊度turbidity=83-99% <ref name=Lantagne/><ref name=low>[[#Low02|Low]] (2002)</ref>|实验室lab:铁iron=无