Isaya-Janwithayanuchit, et al. (2008) found as water vending machines became popular in Bangkok, studies describing the qualities of water from the machines are still scarce. A total of 546 water samples
Physical as a result, the levels of pH, temperature, color and odor
Microbiological qualities were assessed bacteria, total coliforms, Escherichia coli, Pseudomonas aeruginosa, algae .
The results indicated that the qualities of the 52.9 percent of samples collected from water vending machines were critical therefore consumers should be very careful and duly well informed about water quality of vending machines.