Darthvapor - I called my hydro store and they said they had never herd of this and have recently ordered sulfer two weeks ago. They currently have 4 bottles left, so if you need it you should run and get it. You know some hydroshops may not sell it anymore because of how effective, cheap and easy it is. Sprays never work or they screw up your crop, both require buying more hydro store crap.