Product review (4 stars): Can tell the difference
This filter really works well. I can actually detect the difference in the taste of water between the tap an the filtered one. I have been using this for more than 5 years and it has worked wonderfully. Once the filter has outlived its use the water flow will slow down to a trickle so that you know that it needs to be changed.

Took off one star because the twist lock mechanism is faulty such that once every year or two I have to replace the whole filter kit (which is this item GXRLQ). In theory once this kit is installed, you should need to only buy the replacement filters i.e GXRLQR but unfortunately from experience this is not the case.