Inhibits scale formation and filter sediment, and removes chlorine odor and taste, so your ice is always clean and refreshing. Life expectancy of the water filter is 6 months during normal usage. Specifically for undercounter ice maker UC-15. Please note: This filter is for use in the Sub-Zero line of Icemakers only and will not fit your Sub-Zero Full-Size Refrigerator. For that, you should purchase item number 4204490.