I got the LS at Wally but Amazon has it. Anything used as a water softening stuff for a dishwash equiavalent should work. It is more needed in hard water, if I understand it correctly. I have a treatmnt system but still put a pinch, less than 1/8 TSP, in a 12 pound Thumblers. If you over do it the brass comes out a rosy color. Kind of like the glasses I wear.
Greg
Greg