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Old 10-17-2012, 11:54 PM   #4
dmagerl
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You need to test whether it will fall apart under water. Just take a small amount and put it in a cup of water and lt it sit for a week. If it turns to mud, dont use it. If it holds it shape and it wont pulverize under finger pressure, its good to go.

I used this technique to add Hi-Dri to my tank. Didnt even wash it.
http://www.youtube.com/watch?v=d-XB0...eature=related
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