Aquasana AQ-4000W-DVPI is a water purifier that sits next to the sink as it filters water directly from the faucet. It gives clean, great-tasting water as it is certified to reduce or eliminate up to 99% of 77 water contaminants such as lead, PFOA/PFOS, chlorine, chloramines, mercury, herbicides, pesticides and VOCs. This purifier filters 15x more contaminants compared to the leading pitcher filter. It also retains beneficial minerals in the water including calcium, potassium, and magnesium