Product review (5 stars): Stick W/ This OEM Filter For NSF 52/53
I haven't found an off brand that filters lead, tylenol, hormones,...in addition to filtering chlorine like this OEM GE filter.

I had to call the number on it for customer service on how to install it because it's a little more difficult & firmer than Sentinel. They gladly walked me through it. And i finally got it after giving it a bit of force to slide it in so the lips can catch it so that i could finally turn it.
So be sure to use a little bit of force to slide it in then turn until it stops.

Mine arrived in a plain white box with no instructions, i wish they would've said that & deducted some of the price for that. But i looked at it carefully & verified that it's legit. It came in it's vacuum shrink wrap afterall.