These include germs, amoeba, parasites, cysts and viruses. In my experience chlorine does not fully eliminate these organisms. During our recent local drought, even though chlorine levels were drastically increased, local health practitioners reported a rash of parasitical infection.

Filtration level Is important for exclusion of parasites. Although nothing higher than one micron will exclude Cryptosporidium and Guardia, it requires a filtration of less than 0.1 micron to exclude viruses. Few people realize that flu viruses are carried on birds that migrate from Asia. These birds settle in our reservoirs, and outbreaks follow