yes i have tried it. I have added it on many occasion to my reservoir - but must add that i had already beaten the slime at this point with microbes from a pond filter. However it is a very potent source of exactly what is needed and I would be very confident. I could literally drown you in the stuff, if only I could give you some so we could test it. As Itsgrowtime says try the bottled stuff because it obviously cant wait.