The Culligan D-30-A Level 2 Carbon Block Water Filter reduces Giardia, Cryptosporidium cysts, Lindane, Atrazine (a pesticide and herbicide), asbestos, and mercury. It will also reduce chlorine taste, odor, and sediment. The filter comes with a 0.5-micron (nominal) filtration and has a filter life of 12 months or 1000 gallons.