Does anyone know of a source for food grade MgCO3?
It's just a geeky thing, but this is one of the few salts I'm mssing. I have a hard time making true Munich water w/o that stuff since there is a lot of Mg and little Cl or SO4. I know that mimicing that water exaclty doesn't really matter as long as you match residual alkalinity, hardness and maybe the Cl/SO4 ratio. But I'd like to have that salt too. A fellow brewer was able to get me MgCl2, which isn't widely used by brewers either.
Google didn't show much. There seem to be little food uses of that stuff. I have it as chalk for climbing but I don't trust that it is pure.