Let me take a crack at it (I sort of understand how it works, but will bow to those much more knowledgeable). RO water is called "pure water" because units that produce RO water remove all dissolved solids and bacteria and other matter down to a "pure" state. Depending on how well maintained all the filters, etc. are, it is feasible to achieve purity of 99%+ H2O with no additives. This is, essentially, distilled water. In a very simplistic description water is forced through a membrane with microscopic pores to remove floating (non-disolved) solids. Then it is passed through a variety of filters that further remove dissolved solid material like calcium or salts. I am skipping lots of stuff and taking liberties with the description of the process.
A few things to consider. While RO units are inexpensive to install and maintain, they must be maintained. This means regular replacement of all the filters. The better ones can have 4-5 filters of various sorts and duties. It can mean replacement of the semi-permiable membrane (rare, but does happen). These units are very efficient at reducing the impurities in most water. You can purchase the same water from many grocery stores at water stations maintain by Culligen by bringing in your own jugs. I've seen it as low as 30 cents a gallon with your own jug. I pay a bit over $19 per month to rent one from Culligen, but they maintain the unit and replace filters, etc. Hope this helps.
Last edited by Ross; 06-11-2007 at 04:03 PM..
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That we get a lot of up here in the north (Yankee Country) 
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