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Useable source of Calcium and Magnesium?

At the local health-food store, they have a product that contains Calcium
Carbonate and Magnesium Oxide, and the other other ingredient is
cellulose.    It looks to me like a good source for increasing the GH and KH
of my water.   Is there anything I should be aware of before using it?  I know
the calcium carbonate part is fine, and I think magnesium oxide should be 
fine, but I'm not sure.

Also, it states that each tablet contains 250mg of Calcium as Calcium Carbonate.
Does that mean each tablet contains 250mg of Calcium, or would it be 40% of
250 mg (since 40% of CaCO3 is calcium, if I added right)?

I've already prepared a quick test solution with a crushed tablet.  The cellulose
is messy, but a quick strain thru a papertowel removed all of it.   

Chuck Gadd