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Referring back to Rob Toonen's study, I don't believe or grain size or depth had much bearing on the efficacy of DSBs or plenums. I think large grain <1in was less effective. That was over 2 years ago...so my memory could be faulty. I'll try to find my notes.
goodreef...how is denitrification different between the two setups? No offense, but I don't understand. If Julian argues for +4 inches on both...I don't get it. The only difference is recommended grain sizes. Basically, you're just providing more anaerobic intersitial spaces with the DSB and utilizing the "dead space" under the plenum for the same purpose. I don't even know if this is accurate...no offense to Julian Sprung. Mr. Borneman argues that the plenum is just dead space.
I'm not trying to argue with you...just don't understand what you mean by "denitrification process in both are different".
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