Registration is necessary to transfer chlorine into the service cylinders used at poolside.
Contact your state agency in charge of enforcing EPA regulations. You must also register with them. The US EPA in Washington, DC should be able to identify for you the agency to contact in your state. Contact your local fire marshal to obtain information on complying with all fire department requirements for the storage of chlorine gas. Contact you local environmental management department to obtain information on complying with all of their requirements for storage of chlorine gas.