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Seachem De*Nitrate is a porous biological filter medium that hosts anaerobic bacteria to break down nitrate in freshwater and saltwater aquariums. It is not a liquid additive: it goes in a filter or reactor where flow is slow enough for low-oxygen bacteria to colonize the deep pores. Seachem positions it as a sulfur-free alternative to sulfur denitrators, so it carries no hydrogen sulfide risk. It suits keepers with a persistent nitrate problem who already run a mature filter and test regularly. Compared with sulfur media it is gentler and simpler, but it works slowly and needs the right flow and time to cycle.
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Lowest price we've seen: $6.99 on Nov 13 at The Hidden Reef. Tracked across 10 stores since Nov 13.
Owners who use it as directed report gradual nitrate reduction in tanks where water changes alone were not keeping up. Many note it took weeks to cycle and did little until flow was slowed. Skeptics say results are inconsistent and that it is no substitute for water changes.
Seachem De*Nitrate is a 500 ml aquarium water treatment for fish and aquatics. It removes nitrates, nitrites, ammonia, and organics from the water.
It is a high porosity biological media. Its pore size suits anaerobic bacteria, which help break down harmful substances in the aquarium. Unlike sulfur-based media, it carries no risk of hydrogen sulfide production.
