APEX MR-2030 Undercounter Water Filter System - Made in U.S.A. Stage 1- 1 micron polypropylene sediment pre-filter to extract suspended materials such as sediment, rust, insects, and other particles down to 5 micron. (Replace every 6-8 months) Stage 2 - Carbon block filters to absorb heavy chlorine byproducts such as chloramines, THM, and TCE. The double carbon briquettes filter out organic matter from water without release of carbon fines. (Replace every year) Stage 3 - Carbon block filters to absorb heavy chlorine byproducts such as chloramines, THM, and TCE. The double carbon briquettes filter out organic matter from water without release of carbon fines. (Replace every year) Sleek designer faucet to match your modern kitchen Replace with genuine Apex RF-2030 replacement filter pack for undercounter systems