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post #56 of (permalink) Old 02-02-2013, 02:38 PM
Rob in Puyallup
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Join Date: Jul 2009
Location: Puyallup, WA
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Re: seachem matrix bio best ?

I agree, it looks nothing like the pumice that we find around here from Mt St Helens.

Perhaps it's similar to rockwool. A mineral that's melted then spun in the cooling process?

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