I own a Katadyn & MSR filter so I can't speak from experience, but according to their website:

General Ecology water purifiers utilize our unique, proprietary "Structured Matrix" chemical-free technology to offer the highest level of water purification instantly without chemicals, pretreatment, double pumping or hold time. General Ecology's water purifiers remove viruses, bacteria, and protozoa, plus many organic and inorganic chemical and aesthetic contaminants at the highest "purification" micron level (0.4 microns absolute) to provide great tasting water while protecting against water related disease. First Need Deluxe Water Purifiers like all General Ecology Water Purifiers are certified to meet EPA Microbiological Purification Standard against cysts, bacteria AND virus!




I'll be the first to agree that you can't believe everything you read but this might warrant a little more research...