Cant remember what it was that we dont want in the perlite. Some grades come with something added and I cant remember what that was. Was it silicone? My product is called ZONELITE PERLITE it is sold by Grace Perlite and has the INDUSTRIAL grading on it. Does this sound ok to use. I had Vermiculite for the hearth and all went well but now I have perlite for the Dome cover later on....thanks wayne
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