This video shows how to replace the filter cartridge in a the Elkay EZH2O Liv Built-in Bottle Filling Stations.

For the residential versions (LBWD00BKC, LBWD00WHC, LBWD06BKK and LBWD06WHK), use Elkay WaterSentry ERF750.
For the commercial versions (LBWDC00BKC, LBWDC00WHC), use Elkay WaterSentry ECF3000.