Many people use vacuum flasks to enjoy either cold drinks in summer or hot drinks in winter. It is a good practice to replenish water often but one should remember to wash the vacuum flask thoroughly and regularly, for the bacteria will accumulate.
Taiwanese Family Practitioner, Chen Chung Hsien, reminds us of washing our vacuum flasks thoroughly to avoid a film of microbial plaque forming over time.
A microbial film is formed by microbial secretion, which congregates on the surface of an organism or a non-organism. An example of the congregation on teeth (living structure) is called teeth plaque. That congregating on a non-organism is a sticky film inside a water collector of a dehumidifier, for example….