Given that the CSM+B stuff is cheap by the pound and not flammable I'd
just mail order it frankly. I'm not aware of a substitute. Apparanly you
cam mail order KN03 which is a little scary but, whatever. It' usually
available locally as stump remover though or any good chemical supply
hose shold have it.

The amount of potassium sulphate is so damn low and since the phosphate
and nitrate are potassium salts I'm not sure it even makes any sense to
add it.

Magnesium sulphate is "epsom salts" found in any chemists.


--
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