Where to buy magnesium sulfate?

[patricksak]

Does anybody know where to by Gypsum that is safe to use for aquarium water ? I have found gypsum at the local Nursery but it is for agricultural use.

[Moon]

Try your local grocery store. It is usually in the pickling section.
Joe

[dishpanhands]

magnesium sulfate is Epsom salts..

[dishpanhands]

just wanted to tell you that Gypsum that has been baked till all the water is out and the its ground to a powder is knowing as Plaster of Paris

[Graham]

And Plaster of Paris is calcium sulfate 2CaSO4 and it'll make your water rock hard

G