Continuum Aquatics Bact Rox Nitrazex – Small Porous Filtration Media to Remove Nitrates, Nitrite, and Ammonia in Reefs, Marine Saltwater and Freshwater Aquariums, 20-l : Pet Supplies - Amazon.com
Nano-Tech Anaerobic-Block Aquarium Filter Media - AliExpress
SEACHEM de*nitrate Reducer Anaerobic Aquarium Filter Media denitrate | eBay
Suppressing Nitrite-oxidizing Bacteria Growth to Achieve Nitrogen Removal from Domestic Wastewater via Anammox Using Intermittent Aeration with Low Dissolved Oxygen | Scientific Reports
Anaerobic Filter for Wastewater Treatment II Description and Design - YouTube
Amazon.com: de*nitrate, 100 mL bagged : Industrial & Scientific