Product review (1 stars): DO NOT BUY if health is a concern
This filter does not filter out very harmful things like lead. You want a water filter that is tested against NSF Standard 42 and 53. The key here is 53, which is lead, asbestos and other crap you probably do not want in your body. This filter is only 42, which are only things like taste. I've cut and pasted some info below, or you can go to the NSF website [..]. I wish I had known all this before I ordered a 3 pack of these. Like everyone else, I liked the cheaper price but I'm switching back to the more expensive ones that are 42 and 53 certified. Below is the NSF info:

NSF International: Who they are, what they do
NSF International, established more than 55 years ago, is an independent, not-for-profit product testing and certification agency that sets standards for a wide variety of home and industrial products. It is accredited by ANSI, the American National Standards Institute, and it has been designated by the World Health Organization (WHO) as a Collaborative Center for Drinking Water Safety and Treatment.

The NSF International standards for water treatment systems are based on input from experts in public health, industry, government agencies, and academia.

NSF/ANSI Standards 42, 53 and 55.*

Standard 42, Aesthetic Effects:
Tests systems for their ability to reduce drinking water contaminants that affect the taste, odour, and clarity of drinking water.

Standard 53, Health Effects:
Tests systems for their ability to reduce a wide range of drinking water contaminants, including lead, asbestos, VOCs, and pesticides. Standard 53 is much more difficult to meet than Standard 42. No other UVcarbon-based system has been certified to reduce more health-effect contaminants than the eSpring Water Purifier.

Standard 55, Class B, Ultraviolet Microbiological Water Treatment:
Standard 55 applies exclusively to systems that use ultraviolet light. It certifies the system's ability to reduce normally occurring microorganisms in municipally treated water.