I assume you are referring to calci-sand type products? These are worse than sifted playsands, they are NOT digestable, this is proven, they clump when wet (~like when inside your leo's tummy), and above all, it encourages the leo to lick it because it contains calcium.

I strongly suggest you don't advise any one to use these products as they increase the risk of imapction alarmingly.

http://coloherp.org/cb-news/archive/vet-med/CalciSand.php

I have provided a link that shows some findings of the attempts to dissolve calci-sand in acid solutions. It isn't positive at all. Please don't use these products.

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