Product review (3 stars): How to tell the quality of the filter?
It is working as a water filter, I presume.  How well is it filtering the water?  I have no idea. The bottom of the filter should have a place to put a sticker on it, what month you have to change it or what month you installed the filter. The price of the filter was acceptable.  I still don't know the quality of the filter and not do I know how to tell.