Product review (3 stars): EcoAqua EFF-6013A vs GE MWF
The manufacturer of the EcoAqua EFF-6013Aclaims that it is certified to NSF 42.
http://www.ecopurefilter.com/content/?116.html

You can very this claim at the NSF website:
http://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=EFF-6013A&Standard=&ProductType=&PlantState=&PlantCountry=&PlantRegion=&submit3=Search&hdModlStd=ModlStd

I called GE and asked them what NSF standards their filter MWF has certification for. They said NSF 42 and NSF 53.
I this sense, the GE Filter seems to be better than the chinese clone. I wonder wht they didn't get NSF 53 certification. They may be as good as the GE, but we have no way of knowing.

See below what the 2 standards mean:

NSF/ANSI 42: Drinking Water Treatment Units - Aesthetic Effects

NSF/ANSI 42 establishes the minimum requirements for the certification of POU/POE filtration systems designed to reduce specific aesthetic or non-health-related contaminants (chlorine, taste, odor and particulates) that may be present in public or private drinking water.

The scope of NSF/ANSI 42 includes material safety, structural integrity and aesthetic, non-health-related contaminant reduction performance claims. The most common technology addressed by this standard is carbon filtration.

NSF/ANSI 53: Drinking Water Treatment Units - Health Effects

NSF/ANSI 53 establishes the minimum requirements for the certification of POU/POE filtration systems designed to reduce specific health-related contaminants, such as Cryptosporidium, Giardia, lead, volatile organic chemicals (VOCs) and MTBE (methyl tertiary-butyl ether), that may be present in public or private drinking water.

The scope of NSF/ANSI 53 includes material safety, structural integrity and health-related contaminant reduction performance claims. The most common technology addressed by this standard is carbon filtration.