SalinSalt Therapy benefits people with respiratory conditions and breathing difficulties. Relief from Respiratory Conditions, Asthma, COPD and other breathing problems.Changing the Salin Plus Filter The following procedure must be used: Unplug the AC/DC adaptor from the main voltage supply. Remove the plug from the DC input jack in the back of the device. Remove the lid and then pull out the filter. Put back carefully a new filter into proper slots and put back the lid. Renew the device’s supply. ** Read the instructions of the filters carefully before making this operation.