It is non-toxic, non-flammable and is non-ozone depleting. From time to time, refrigeration and air conditioning systems suffer failures which result in contamination. The most common such failure is a compressor burnout. During such an event, the refrigeration system becomes contaminated with large quantities of unwanted particulate, sludge, acids, carbon residues and possibly moisture. All of these contaminants must be removed before the system can be returned to duty. Rx11-flush® 26-lb. cylinder flushes over 50 tons.