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Old January 23rd, 2010, 11:38 AM
Status: Offline
Join Date: Jan 2010
Posts: 566
Default Re: Phunnel question (worth reading, i promise)

in that case im going out on a limb as saying they use something that was already fired and then ground it up to use it as aggregate. im guessing this because when i broke mine it reminded me of concrete that did the same thing
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