Good
It does work, but it takes anywhere from about 3 weeks to months to work depending on levels of nitrates. I had 160+ppm of nitrates in a new tank and it took about 3 months with no water changes as there was no livestock in the tank. Now I have nitrates down to about 2.5ppm and do a weekly water change of about 10%. The media must be added continuously as it gets consumed while reducing nitrates.
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