Best Under

Talk about thorough: This reverse osmosis (RO) system from iSpring removes up to 99 percent of more than 1,000 contaminants found in tap water, including lead, arsenic, chlorine, fluoride, and asbestos. Its impressive six stages of filtration include sediment and carbon water filters to remove large contaminants and protect the reverse osmosis membrane from chemicals like chlorine and chloramines.

The reverse osmosis system's filter removes contaminants down to 0.0001 microns so that only water molecules can fit through. An alkaline remineralization filter restores healthy minerals lost in the filtration process, and the last filtration stage gives the water a final polish before being delivered to the included brass faucet, which has a sleek brushed-nickel design.

An electric pump boosts the water pressure so there is less waste during the filtration process, with a ratio of 1 filtered to 1.5 wasted gallons. The water filters need to be replaced every 6 months to a year. Installation can be done by the user with the help of the company's written and video guides. Live phone support is available for those who run into any problems or have questions not covered by the provided guides.

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Get the iSpring under-sink water filter at Amazon , Lowe's , The Home Depot , or Overstock .