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I did the vodka thing for a while and never felt like it did enough.
Switched to a sulfur denitrator and said goodbye nitrates. After a case of vodka the denitrator is more cost effective. I built my own, when I started I had nitrates over 50ppm going into it, after the denitrator matured water comes out 0ppm. Today my nitrates are under 4ppm (red Sea nitrate test, I do the high range test). It can take a few weeks for your reactor to grow enough to be useful and noticable.
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