In 2008, some people reported 9 / 420 / 1260 Mg
It's made to Tunze's spec by HW Marine in Germany. Same mfg plant that makes Reefer's Best and HW Marine's own label.
I used Redsea coral pro. Calcium and alk was through the roof. Recently switched over to the brightwell salt though for the lower alk because I'm dosing vodka. They're both 60 per bucket at Tom's.