The FXSVC GE Smart Water filter is a dual-stage under-sink filter that comes with one sediment pre-filter and one carbon block post-filter. The grey capped filter should be the first stage of filtration, accepting the in-flow of water to the system, followed by the green capped post-filter, as the second stage of filtration. The GE FXSVC is compatible with any brand of water filtration system that uses 9 3/4 inch x 2 1/2 inch filters.
