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#3
July 26th 03, 04:52 PM
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crushed marble
In article , Jason wrote:
Has anyone used crushed marble as a substrate. The size is about .25 mm average. Home depot has it here in SoCal for $4.49 a 50 pound bag. My understanding is that the silica in Marble is insoluble. If it is a fine as you say then it should work in a DSB. If you ask the right people you should be able to get the rock "Assay" which will tell you what exactly is in the rock. 
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