TheUV water disinfection process is completely natural. No chemicals are added, and the water chemistry is unaltered. Ultraviolet light deactivates harmful microorganisms such as bacteria and protozoa by disrupting the DNA, effectively preventing them from multiplying and causing illness. Pathogens are destroyed as the water passes through the disinfection chamber. E-coli, Cryptosporidium, and Giardia lamblia (Beaver Fever) are waterborne microorganisms which are easily controlled by UV disinfection.