Product review (4 stars): Works like a filter should, not NSF certified to my knowledge though.
The Pure Line MWF compatible replacement filter works like it should. The installation is easy because the instructions are very clear. It costs significantly less than the actually brand named filters. I replace my filter once every 3 months or so because we have large family and use it often. It gets quite expensive. The taste is not as great as when we use the OEM filters but I feel like cost wise, we can deal with it and the water shoots our quite quickly. I feel like this is a quality replacement filter that works just as well as the original brands filters. The only thing that bugs me about this filter is that it is not NSF certified or if it is, I didn't see any indication on either the box or the filter itself. I know it is suppose to be a charcoal filter but without the certification, I'm unsure what is truly inside and whether or not the filter is actually working.
Overall, I think it works really well, there are just some things that I'm unsure about but it works great.

PROS:
-cost is cheaper
-water flow is great
-water taste is okay

CONS:
-water taste is not as great as the original
-no NSF certification
-not made in USA

I received this item at a discount in exchange for my honest and unbiased opinion.