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Old 04-30-2013, 02:59 AM   #16
James M
Planted Tank Obsessed
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Join Date: Jun 2012
Location: Puget Sound, WA
Posts: 433

You want a pure, calcined clay with no additives - I'm not familiar with oil-dri so I can't answer that definitively. The products sold for baseball field topdressing work great - but I mixed it with soil about 50-50. Some people use it by itself, which is fine too but it doesn't hold the plants as well until the roots really grow in.
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