I ordered GE Replacement Water Filter Set as indicated on Amazon’s product description as FXSVC Rev. 2, but the item shiped was an older model (Rev. 1) with a different looking tube. There is one green and one brown tube in the set. The brown-color filter tube looks very different between the older model and the Rev. 2. The Rev. 2′s brown-color tube has solid plastic housing while the Rev. 1′s tube that FilterFast shipped has white filter fabric outside. I understand that the brown-color tube contains charcoal filter to improve water taste. The older model allows water to flow through the surrounding surface of the charcoal tube while the Rev. 2 pushes water through the entire length of the tube, so I am assuming that Rev. 2′s method is more effective as water get pushed through more charcoal contents. Other than that the product looks and works all right....