ChlorTainer is a high-pressure secondary containment vessel into which a 1-Ton or 150-lb chlorine gas cylinder is processed. All vessels are built to ASME code and can easily withstand the maximum pressure produced by a failed cylinder. If the cylinder should leak, the chlorine gas is contained within the vessel and processed at a normal rate. All of the chlorine gas is used, and no hazardous waste is generated. No scrubber systems, fans, pumps, tanks, or mechanical systems are required and ChlorTainer is defined as passive for RMP purposes. ChlorTainer simply bolts down to the ground and can be installed indoors, or even in an open-air structure as long as it provides shelter from direct sunlight and rain. ChlorTainers are installed in more than 100 facilities throughout the U.S. and in other parts of the world because the vessels require minimal annual maintenance and enhance site security while providing fail-safe protection for operators.