Daschner F D, Rüden H, Simon R, Clotten J
Institute of Environmental Medicine, Freiburg, Germany.
Eur J Clin Microbiol Infect Dis. 1996 Mar;15(3):233-7. doi: 10.1007/BF01591360.
The microbiological quality of filtered water in a commercial water filter system (Brita) was tested in households and in two laboratories. In 24 of 34 filters used in households, bacterial counts increased in the filtered water up to 6,000 cfu/ml. In 4 of 6 filters tested in the laboratory, bacterial counts in the fresh filtrate were higher than in tap water after approximately one week of use both at room temperature and at 4 degrees C, suggesting growth or biofilm formation in the filter material. In some cases colony counts in the filtered water were 10,000 times those in tap water. The filter material of 5 of 13 new commercial filters was contaminated with bacteria or moulds. National or international regulatory agencies should ensure that water filters marketed for domestic use do not allow deterioration in the microbiological quality of drinking water.
在家庭和两个实验室中对商用滤水系统（碧然德）中过滤水的微生物质量进行了测试。在家庭使用的34个过滤器中，有24个过滤器过滤后的水中细菌数量增加，最高可达6000 cfu/ml。在实验室测试的6个过滤器中，有4个过滤器在室温及4摄氏度下使用约一周后，新鲜滤液中的细菌数量高于自来水，这表明过滤材料中存在细菌生长或生物膜形成。在某些情况下，过滤水中的菌落数是自来水中的10000倍。13个新的商用过滤器中有5个的过滤材料被细菌或霉菌污染。国家或国际监管机构应确保投放市场的家用滤水器不会导致饮用水微生物质量下降。
