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Old 02-06-2013, 10:03 PM   #71
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Originally Posted by VAtanks View Post
The only thing I can say for sure is the channels or pores under microscope are very similar.

I would think this would be the important part for it's purpose as biomedia. Even if it isn't exactly pumice, if it is similar enough, then people could probably get similar results using much cheaper horticultural pumice.
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