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Re: [APD] old soil substrate
Based on Walstad's excellent treatise, doesn't it take many
years for the soil to be depleted?
Yes, but she doesn't recommend a coffee can full of soil in either a 50 or
20 gallon, but a 1" layer. Even assuming the largest size coffee can, I'm
sure I have more than that to make 1" in my 7-gallon bow tank.
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