What is the difference between a filter and a purifier?
A filter will remove 99.9% of Protozoa (Crypto & Giardia) in the water, a purifier must remove 99.9% of Protozoa, 99.99% of Viruses and 99.9999% of Bacteria. The reason those numbers are important is because of the size of the various contaminants and how many of each can make you ill. Protozoa are anywhere from 1 to 100 microns in size. Bacteria are between 0.1 and 1 micron. Viruses range from 0.01 to 0.1 micron. There is not a filter small enough to filter out the viruses. Populated areas of developing countries have a high risk of protozoa contamination, a moderate to high risk of bacteria contamination from both human and animal carriers and a moderate to high risk of virus contamination.
