Someone a while back came on here claiming they had a new lfs with lots of tanks and they all had a big cannister loaded with nothing but seachem matrix, these tanks got a monthly wc and never registered high nitrates. The claim was in fact that a ton of matrix would eventually remove nitrates. I have a whole tray in my cannister loaded with matrix. I still get nitrates, i don't know enough about the process but I guess it can work. It is a good biomedia anyways.
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