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Originally Posted by crusty1
With my experience I used both aragonite and crushed oyster shells. I found with only the oyster shells the cement wouldn't stick to very well and the final product was very brittle. I added some aragonite with the oyster shells and it made a great product. Add a little rock salt and you'll have lots of caverns.
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I did have a few brittle pieces on my second bactch with just Oyster Shell. I think the trick was a little more cement and wetter made it work better. Also remember that the longer it is most the stronger it will set. I took them right out of the mold and placed them in a kiddy pool for month. THey are very poress and very strong.