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Re: CaCO3 sources

Where I live, (southern Alabama) oyster shell is available as a
supplement for puoltry feed.  It is available in any feed store, at
least it is here, anyway.  I have used it as a substrate for a brackish
tank containing local species.  Be forwarned:  it is impossible to rinse
this stuff enough.  It took over a week before my tank looked like water
again instead of milk.

<Has anyone used oyster shell as a source of CaCO3?  If so, where does
<find it?