The True(TM) air filter should be checked every six months. The beads will change color as it saturates with water. For convenience, a reminder to check this filter is programmed into the hot tub control panel and your SmartTub app. Changing the filter is a tool free process that starts with removal of the hot tub front panel to access this filter’s location. Simply detach the hose, remove old filter and snap in the new filter ensuring all caps on the filter for shipping have been removed. The air filter ensures your system will operate and peak efficiency to clean you water.