Hi Corey, as you say there is a process of creating K2SO4 where you react KCl with sulphuric acid. At 43% K it is a bit higher than what I am use to for K2SO4 but there is always some deviation. If you want to you could do a fertilizer analyses to be 100% sure, or maybe call the manufacturer and have them send a analyses, as I’m sure they do some for quality control purposes.