Keeping Clean. Aquasana's AQ-4000 water filter removes a variety of contaminants from tap water, including chlorine, lead, VOCs, MTBE, and microbial cysts. Removal rates for many compounds are 98 percent or higher, the company says. The double-filter unit can be attached to the existing faucet and placed on the counter, or it can be tucked beneath the sink and connected to a new dedicated faucet. Replacement cartridges ($48 apiece) treat 500 gallons of water. The AQ-4000 costs $100 if ordered directly online. Sun Water Systems, 866/237-4658, www.aquasana.com

On Tap. PUR's FM-3700 attaches directly to the kitchen faucet; the faucet aerator simply needs to be removed and replaced with the filter housing. According to the maker, the unit sharply reduces levels of many contaminants, including asbestos, lead, solvents like toluene and benzene, and microbial cysts. A built-in monitor shows when the filter...

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