The materials in the Main Filter do have the ability to capture and hold smoke, odors, and other VOCs, but can only securely hold up to a certain amount. After the limit is reached, the extra molecules that cause these smells will be released back into the environment. Think of the filter like a large parking lot at a major event - the parking lot has enough room for a large number of cars, but once the parking spaces have been filled any new cars must find a different place to park.
The Main Filter in the Puritii Air Purification System will last for a long time in a normal household environment, but can be overwhelmed if placed in areas of extreme pollution like cigarette smoking. When you start to smell odors coming out of the Puritii Air Purification System, it is time to wash your Pre-filter and replace your Main Filter. Replacement Main Filters can be purchased in Shopping Cart or by calling ARIIX Europe Partner Support.