FLO PRO® A/C Severe Clog Relief is a 5X Concentrated formula and is the most powerful and technologically advanced A/C drain line cleaner ever developed. iFLoBiotic™ proprietary technology harnesses the power of a specially formulated enzyme and bacteria to specifically target Zooglea bacteria that grows inside your A/C drain pan to break it up and convert it to water. iFLO PRO® Severe Clog Relief will clear a clog inside of an hour and continue to work over 24 hours.