Found mine in rural king. Don't suppose u have one by you? Only place I could find it around me.
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There ya go then! The granulated is the way to go........PDZ comes in a powder too, very-very dusty.http://www.ida-ore.com/products/horse-fresh.html
I decided to give it a try, because that's what I can find. Seems to work just fine so far. You are right, aart, it is Zeolite.