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Seachem DeNitrate is a porous natural filter medium for freshwater and saltwater aquariums. Its pore structure supports aerobic nitrifying bacteria near the surface and anaerobic denitrifying bacteria in the core, so it can lower nitrate as well as ammonia and nitrite. It works best in a slow-flow path under 50 gallons per hour, where both processes run; above 100 gallons per hour it acts as a plain aerobic biofilter. Compared with resin and zeolite nitrate removers, it relies on bacterial denitrification rather than chemical binding, so it needs time to seed and does not strip nitrate instantly.
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Lowest price we've seen: $18.74 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners who run it in low-flow canisters and sumps report gradual nitrate reduction after a few weeks of seeding. Others who put it in high-flow paths see little nitrate change and treat it as ordinary bio media.
Seachem de*nitrate is a natural, porous filter media for aquariums. Its pore distribution and geometry support aerobic nitrification within the first few millimeters of depth and anaerobic denitrification at the core. It has a high surface area and supports a high density of bacteria.
The media removes nitrate mainly through anaerobic denitrification, the same process used by live rock or reef rock. Water is forced to filter through the porous media, which greatly increases efficiency. It can also trap some nitrate, but this capacity is quite limited, as with other nitrate-retaining materials such as certain zeolites and synthetic resins.
Anaerobic conditions form because of the porosity and because the aerobic process at the surface uses up the oxygen. Excessive flow rates should be avoided, since they can keep an adequate anaerobic environment from developing. The media also works as an aerobic biological filter in drip trays, canister filters, sumps, or box filters.
