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Nitrates in the marine aquarium can be controlled by the use of a sulfur reactor and elemental sulfur. A sulfur reactor will usually incorporate an up-flow type of reactor, as water will enter the reactor from the bottom and flow up to the top. The flow rate for a sulfur reactor should be very slow, as the bacteria will consume oxygen. The bacteria will also start to consume nitrogen when oxygen is no longer available. The chemical reaction that takes place releases excess hydrogen ions, which will also make the water more acidic. Nitrogen gas will also be produced during the process.
Carbon dioxide may also be produced during the chemical reaction that takes place, which would make the aquarium water a bit more acidic as well, making it imperative to run any effluent water through crushed coral, or calcium reactor media as that will raise the pH by dissolving the crushed coral.
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Unsuccessful with this media By AndyE on 9/10/2016AndyE wouldn't recommend this product to a friendI worked for months trying to get the Skimz reactor to work with this media. It was cycled and could produce nitrogen, but could never handle more than 2 drops per second, far less than described by skimz and far less than required to remove nitrates from 200 gallons. My theory is that these large beads of sulfur do not have the surface area to grow enough bacteria in the reactor to maintain the anaerobic environment. No other reactor system uses large beads. All use small spherical beads (but the Caribsea brand is hemispherical which plugs up and channels). I am in the process of obtaining Korallin sulfur to see if that works. Attempted to talk to the folks at Skimz, but received little help.
Works, but not as described By Ike. G on 4/25/2016Ike. G would recommend this product to a friendReactor cycled in a day and a half. However, the media didn't arive in nice big beads, a lot of it was dust and smaller beads the size of a rolled up booger.