Calcium Sulfate / Gypsum
mj wrote:
Where can I buy a pound or two of this and not have the shipping be
crazy? Where could I buy it in say a local store? I have all the other
chemicals for my hydroponics except this one and I don't want to have
to buy a ton.
MJ
Plaster of Paris. You'll probably have to hydrate it to make it useful.
Bob
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