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Water dispensers quickly gain high bacteria levels
By Cai Wenjun |
May 16, 2012, Wednesday
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Print Edition
Print Edition
BACTERIA in cold water from drinking water dispensers will soar after seven days and greatly surpass the allowed bacterial limits in ten days, a detailed study has found.
Machines' liners are the most likely spot for bacterial contamination due to their structure, and people must regularly clean and disinfect the machine and shorten the consumption period to avoid intestinal disease, especially in summer, according to the study by the Zhejiang Province Haiyan Center for Disease Control and Prevention.
Similar research done by the Shanghai Center for Disease Prevention and Control showed the same results, as cold water had excessive levels of bacteria while hot water maintained a high quality due to bacteria being killed by the heat.
Officials in Zhejiang Province spent five months checking microbial counts of cold and hot water at different times of day within 10-day periods, along with the change of microbial counts in hot and cold water mouths and liners. The study found the liner is completely contaminated by bacteria within two weeks and the cold water mouth within three months. The hot water mouth still has a 60 percent of quality rate on bacterial counts in five months.
Machines' liners are the most likely spot for bacterial contamination due to their structure, and people must regularly clean and disinfect the machine and shorten the consumption period to avoid intestinal disease, especially in summer, according to the study by the Zhejiang Province Haiyan Center for Disease Control and Prevention.
Similar research done by the Shanghai Center for Disease Prevention and Control showed the same results, as cold water had excessive levels of bacteria while hot water maintained a high quality due to bacteria being killed by the heat.
Officials in Zhejiang Province spent five months checking microbial counts of cold and hot water at different times of day within 10-day periods, along with the change of microbial counts in hot and cold water mouths and liners. The study found the liner is completely contaminated by bacteria within two weeks and the cold water mouth within three months. The hot water mouth still has a 60 percent of quality rate on bacterial counts in five months.
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