If you need to remove certain contaminants that a carbon filter can't, which is a common problem with private wells, a reverse osmosis system may be necessary. Experts recommend the Kenmore Elite Premiere Reverse Osmosis Drinking Water System 38556 (*Est. $255), which is NSF-certified to remove arsenic, nitrate and 12 other contaminants. Owners praise the filter-change indicator light on the faucet, which flashes red when the filters need changing. Replacement filters are $45 for the pair. The semipermeable membrane, which can last several years, costs $55. The filter housing and 4-gallon storage tank are placed under the sink, without any mounting necessary. Customers say they are happy with the quality of the filter water, but a few say the indicator light can be faulty. If you want to spend less, the Whirlpool Reverse Osmosis Filtration System WHER25 (*Est. $155) has a comparable performance, but it requires mounting the filter housing to the sink cabinet wall.
ConsumerReports.org is the only expert review we found that includes reverse osmosis water filters. We also read owner-written reviews at Sears.com, which is where the Kenmore Elite Premiere Reverse Osmosis Drinking Water System 38556 is sold.
Editors at ConsumerReports.org compare the Kenmore Elite Premiere Reverse Osmosis Drinking Water System 38556 and eight other reverse osmosis models. Each system is tested for how well it removes bad taste, lead and chloroform bacteria (as an indicator of ability to remove organic compounds and disinfectant byproducts). Editors also compare how quickly a gallon of water flowed through the filter and whether the filter's flow rate decreased or stopped before the manufacturer's filter life claims.
Review: Water Filters, Editors of ConsumerReports.org
Approximately 20 owners have posted opinions about the Kenmore Elite Premiere Reverse Osmosis Drinking Water System 38556 at Sears.com. It's praised for producing great-tasting water and having a filter-change indicator light.
Review: Kenmore Elite Premiere Reverse Osmosis Drinking Water System, Contributors to Sears.com