T3 Style: Use ONLY genuine AIRAPEX T3 air purifier replacement filters to ensure your T3 air purifier operates as its peak performance. Add Tap Water : Activated carbon water filter captures residual sediment, chemicals, heavy metals and harmful substances in the water. Removes Unpleasant Odors: The premium granular activated carbon filter physically absorbs unwanted odors and fumes such as smoke, cooking odors, and pet odors, as well as VOCs AIRAPEX water filters use finer granular activated charcoal to enhance the filtering process . Suggested replacement after 6 months,with environmentally friendly and healthy materials. More often if you have hard water.