Product review (4 stars): Great Value
I'm not sure whether this legitimately is certified as NSF53 as I have yet to see any evidence of this, but it is comparable to the GE filter it replaced both in perceptual taste and in TDS measurement according to my meter. It definitely takes a few gallons of water to gain the normal performance of the filter so don't just install it and expect immediate results. This is true of all carbon filters.