Shagrathanswered grow question 5 years ago I'm using purpinator in my current grow (Got 1l as a freebie grom grow shop) and I tired to look it up on the internet and it appears to have a slighlty different recipe than terpinator. If they don't have some secret ingredient that they don't mention in the bottle it is just not worth it IMO. It says derived from: Mono potassium sulfate, Potassium phosphate and magnesium sulfate. SO it does not have anything special in it unless there is something that they dont have to tell you.