If the hot and cold water containers in barreled drinking fountains are not cleaned for 3 months, a large number of bacteria and viruses will multiply, such as Escherichia coli, Streptococcus faecalis, Bifidobacterium, enterovirus, Escherichia coli phage, Salmonella, Staphylococcus, Vibrio parahaemolyticus and so on. In addition, there are aquatic fungi, actinomycetes and red nematodes, heavy metals and even red worms, which can breed in long-term unclean drinking fountains.