The original Qwik system Flush was developed by Mainstream engineering Corporation for the US air force in 2001. EPA regulations brought about the need to find alternatives for the R-11 and R-113 flushing agents originally used to clean the pilot's oxygen breathing systems. Qwik-SF was developed as a superior, non-toxic flushing agent with no long-term environmental or health risks. This same technology has been utilized to provide a flushing agent for today's HVAC systems that is still easy-to-use, ozone safe, non-toxic and non flammable. Qwik system Flush effectively removes impurities, including oil, sludge, acid and moisture. Qwik-SF is a must for system clean ups, retrofits and system burnouts.