DSB should work just like bio home as they both use anaerobic area to nitrafy nitrate. Bio homes porosity promotes areas with very slow curents were anaerobic bacteria can live doing some reducing of nitrates, I think a heavy bio loaded tank would require alot of this product to make a difference, I'm not saying it wont work, but how much is the question.
A DSB would have a larger anaerobic area being the bottom layer of sand, and would probably remove more nitrates. I might be going out on a limb here, since I'm not an expert on this, but my concern with a DSB is the unknown bacterias that would be grown in areas where there almost no water flow - maybe harmfull to fish. What I would like to build is a DIY Coil/sulfur reactor, Using a coil that about 50-75' of larger hose (not air line since it plugs off after time) 1/4" or 3/8" then going into the camber (like most coil units) with sulfur beads rather than bio material since this will feed the anaerobic bacteria. Here the catch, I would install a small pump to circulate the cansiter removing dead spots. Ok, too break it down now, 50-75' of 1/4" coil this removes or reduces oxygen, canister with say 20-30 lbs of sulfur beads in the bottom and you could add 2-5 lbs of CC on top to maintain pH, and an outlet valve to control the flow. This way is more pricey but requires no dosing or maintance and is safe, I'm going to build a bigger one since I have a very high bio load, I think I'm going to use 50 lbs of sulfur, I would like to be able to denitrate 60-70 gallons a day, which means only one water change a week rather than two and most importantly

Happy Fishes

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