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Seachem de*nitrate is a porous biological filter medium that supports both aerobic nitrification and anaerobic denitrification in freshwater and saltwater aquariums. Its pore structure is sized for anaerobic bacteria, so it can lower nitrate in drip trays, canister filters, sumps and box filters without the hydrogen sulfide risk of some sulfur-based denitrators. It works best with slow flow, under about 200 L per hour, and each 500 mL treats roughly 100–200 L depending on bioload. It suits hobbyists fighting rising nitrate who can control flow through the media; those with high flow should look at Seachem Matrix or Pond Matrix instead.
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It promotes both aerobic nitrification and anaerobic denitrification. Its pore size suits anaerobic bacteria, so it works as a biological filter and does not produce hydrogen sulfide.
It can be used in drip trays, canister filters, sumps, and box filters. Place it so water flows through it, such as in a canister filter, chemical filtration module, or box filter. Rinse off dust before use. Keep the flow rate at or below 200 L (50 US gallons) per hour. If higher flow rates are unavoidable, use Matrix or Pond Matrix instead.
After several days in use, nitrate concentrations should start to fall. They level off gradually at about 4 to 5 mg/L as nitrate. The media is not exhausted as long as nitrate stays under control. If initial nitrate is very high, bring it below 20 mg/L with water changes first. Use enough media to remove nitrate at least as fast as it forms.
