The SmartWater GXRTQ is an external in-line cartridge that is used on many of the older GE refrigerators as well as being a common generic replacement for other manufacturer's fridges (we have heard of these being fitted to Bosch, Siemens, Neff and in some cases even Samsung).
As long as your tubing is 1/4" outside diameter then the GS10J cartridge will serve as a direct replacement, removing chlorine, sediment and dissolved organics from your fridges water supply.
Cartridge life is 6 months or 1100 litres, whichever comes first. All customers will receive a free, no obligation postal reminder around the time the cartridge is due for replacment (these will tie in roughly with your fridge renewal light).