Matrix seems to be a good nitrifying biomedium, so I keep it in several freshwater tanks. However, I am very skeptical of the claims of support for denitrification. I have this as a test in several methods; 1) in a tank-only bag, 2) in a cooktop bag, and 3) in canister filters. The second aquarium has some plants and I am sure that the plants absorb all the nitrates. In the 1st aquarium I do 50% toilet every two weeks because of nitrates. In the third (largest) tank I have about 2.5-3 liters of material in 2 canisters. I've never had a problem with ammonia or nitrite, but due to the higher nitrate levels, I have to flush 66-75% toilet weekly. So it doesn't work (for me) as a support for denitrification. That being said, I think it's *possible* for denitrification, but I don't think it's likely. I believe that while it can be used in applications with flow rates >50 GPH, in my opinion it will not be sufficiently anaerobic if the water is not substantially depleted of most (98%) dissolved oxygens prior to entering this environment conditions. in the matrix core for denitrifying bacteria. In most conventional aquariums, where enough oxygen is consumed at the surface of the matrix for anaerobic conditions, there simply isn't enough ammonia + nitrite.
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