Product review (5 stars): Great filters but ...
These filters are great, and yes we can find third party MWF OEM filters (like pure H2O) for as low as ten a piece, but they are not NSF 53 certified (but only NSF 42). Additionally as mentioned by others GE stopped selling MWF and instead is shipping out MWFP with the P standing for Pharmaceutical. As far as price, instead of a three pack at one thirty seven plus taxes here, you might as well buy it from geapplianceparts dot com where you can call up the number on web page and simply ask them to apply a ten percent discount plus free shipping. That should make it cost effective and way cheaper than here, and you also get the added peace of mind that you are buying a genuine product.