Designed exclusively for use with the AquaClear 30/150 Media combination delivers highly effective 3-stage filtration Bio-Max expands the biological capacity of your filter Carbon adsorbs discoloration, odors, and impurities Foam traps particles and debris, offers secondary bio-filtration This Maintenance Kit includes three types of filter media for your AquaClear 30/150 Power Filter. Used together, they deliver highly effective 3-stage filtration to create a happy and healthy aquatic environment.