That link to water
purification is somewhat disingenuous and doesn't apply to water
made by reverse osmosis
watermakers at all.
Watermaker particle size filtration goes down further than bacteria size, down to between 0.0001 and 0.001 microns. See Particle Size Chart
for an example. This particle size is smaller than the Hep A, rotavirus and Norwalk virus mentioned in the article.
In addition, the rotavirus transmission
is from unsanitary conditions and infected feces. While it survives a long time in fresh water, salt water
is a different matter altogether.
While Hep A can be present in salt water
, it's diameter of 0.027 microns is much larger than the particle size that any watermaker lets through.
The Norwalk Virus (more correctly, the Norovirus) is 0.038, so almost 4 times larger than the largest particles that go through a watermaker.
The water coming out of a reverse osmosis
watermaker is about as pure as you can get outside of a lab. Contamination might come from the tank and tubing - but certainly none of those nasty viruses will come from your on-board water.