Kester Solder Saver is available in both 5lb and 25 lb jars. Solder saver is chloride-free, non-flammable, inorganic white powder. 5744 is designed to remove dross (the oxide of solder) from wave soldering machines and solder pots. Kester 5744 stands out from other materials in that it does not result in a tacky residue which is more difficult to use. Instead, 5744 remains as a solid substance that continuously works to remove solder.