gypsum

I love me some gypsum for cannabis. Maybe I can get Jeff Lowenfels to add it to the next revision in Teaming with Nutrients. "The bottom line to the many benefits of gypsum is higher yield at a minimum cost." "The forgotten nutrients Gypsum is also a source of calcium and sulfur, or what...

That you can use gypsum as natural cal-mag? Anybody have any experience? Read it on a couple other forums figured I'd ask RIU there opinion.