According to a study conducted by scientists from Loma Linda University, commercial coolers and vending machines that offer drinking water may contain microbes in greater quantities than regular tap water. This finding is based on the analysis of 70 scientific papers published in the journal AIMS Microbiology.
It was found that bacteria begin to actively multiply in the nozzles and tubes of coolers just a few days after disinfection. The main factor contributing to this is the lack of residual chlorine, which is present in tap water and prevents the growth of microorganisms.
The authors of the study note that if coolers are not cleaned regularly and filters are not replaced on time, such devices can create ideal conditions for the formation of bacterial biofilms. This can lead to the level of contamination in the machines reaching or even exceeding the level of contamination in tap water.
Researchers emphasize the importance of regular and thorough maintenance of the machines, including disinfection from one to four times a month, depending on how often they are used. Otherwise, a familiar source of "clean" water can become a health threat.
