5 Stage Reverse Osmosis Drinking Water System RO Home Purifier "Complete System" Produce up to 50 gallons of top quality water per day. Remove up to 99.9% of undesirable contaminants found in tap and well water. Filters particles as small as 1/1000 of a micron. Most recommended water filtration system by doctors, dietitians, and 1000's of happy homeowners.