Product review (2 stars): Inferior to the GE MWF filter; NSF-42 vs GE's NSF-53
This EcoAqua EFF-6013A Replacement for GE MWF now has NSF certification, but it is 42 -- NOT 53. The GE MWF filter is 53 which filters a lot more. NSF-42 filters basic things like particulate matter and chlorine. But you get what you pay for. It is a lot cheaper. I bought a TDS water tester to see the actual difference in charged ions. The GE filter scored about 330 charged ions. Our tap well water scored 380-420 charged ions. The EcoAqua scored the exact same as tap water. To give you some idea, quality bottled water such as Ozarka, scores about 190. Triple filter under the sink reverse osmosis scores about 40. Five filter under the sink reverse osmosis scores about 10.  On the other hand, the EcoAqua removes enough to make the taste of the water tolerable, though the water doesn't taste as good as the GE MWF filtered water. I gave this product 2 stars because it openly compares itself with the GE filter but  the description conveniently leaves out that it only NSF-42. It is a much inferior filter, though for less than half the price.

Update: the third filter had a life of only 1 month before the water started tasting bad, like our faucet water. So I went back to the GE NSF-53 filters.