A UDF (Upflow Downflow) filter—also known as a GAC (Granular Activated Carbon) filter—uses loose carbon granules to adsorb chlorine, odors, pesticides, and Volatile Organic Compounds (VOCs) from water. These cartridges sit inside standard canister housings and typically require replacement every 6 to 12 months.
A filter housing is a protective casing designed to hold a filter cartridge, bag, or membrane securely in place, ensuring that fluid or air passes entirely through the filter media without leaking around the edges. They are primarily used in water purification,