Product review (5 stars): Perfect fit for new GE refrigerators with the microchip in ...
Perfect fit for new GE refrigerators with the microchip in it.  Says that this version filters out drugs and such that can get into municipal water supply (allegedly).  I HATE that GE put a microchip in this thing so that 1) you can't use the cheaper non-chip version and 2) you can't use a third party version because the fridge will shut off the water if no chip is present.  Incredibly annoying.... it's literally double the cost of the non-chip version.