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Current IssueNovember 26, 2014
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Ask The Expert: Home drinking water
07/08/2003 
 
Question: Q: What is the difference between an under sink unit and an RO system? Where can I find performance ratings on various systems?

Claire Gardinier
Ormond Beach, Fla.  

Answer: A: An RO system is a reverse osmosis unit, which usually combines a sediment and carbon filter with a membrane separation unit that removes contaminants through crossflow filtration down to ionic levels, producing what's considered "purified" water. Typically, it's installed under the sink. However, other units also are frequently installed undersink as well, from basic filtration to more complex systems that incorporate ultraviolet or ozone disinfection. Distillers are usually countertop units. For performance ratings, go to the manufacturer's website. Or you can find out more about certified systems listed at www.nsf.org/dwtu/, www.ul.com/water/ or www.wqa.org (see "Gold Seal Program" at Water Quality Association site).

Hope that helps.

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