Thread: Water quality
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Old 03-26-2014, 03:37 PM   #4
Larry M
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City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 5,924
Quote:
Originally Posted by jungpeter View Post
....However, no reverse osmosis water maker will remove the bacteria in the raw water being used to create fresh water. The bugs are just too small and will pass un-molested into your water tank...
We lived on RO water for over 10 years, with no UV and never got sick from the water. Some people may blamed RO water when it may be poor storage practices. RO systems take out more than 99% of bacteria and virus. Virus .02-.4 micron in size, bacteria .4-1 micron in size. An RO membrane has a pore size of .00001 microns.

There is nothing wrong with going the extra step with a UV sterilizer but the bugs are not to small.

This from the Centers for Disease Control and Prevention

Reverse Osmosis Systems
  • Reverse Osmosis Systems use a process that reverses the flow of water in a natural process of osmosis so that water passes from a more concentrated solution to a more dilute solution through a semi-permeable membrane. Pre- and post-filters are often incorporated along with the reverse osmosis membrane itself.
  • A reverse osmosis filter has a pore size of approximately 0.0001 micron.
  • Reverse Osmosis Systems have a very high effectiveness in removing protozoa (for example, Cryptosporidium, Giardia);
  • Reverse Osmosis Systems have a very high effectiveness in removing bacteria (for example, Campylobacter, Salmonella, Shigella, E. coli);
  • Reverse Osmosis Systems have a very high effectiveness in removing viruses (for example, Enteric, Hepatitis A, Norovirus, Rotavirus);
  • Reverse Osmosis Systems will remove common chemical contaminants (metal ions, aqueous salts), including sodium, chloride, copper, chromium, and lead; may reduce arsenic, fluoride, radium, sulfate, calcium, magnesium, potassium, nitrate, and phosphorous.
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