(1 customer review)


The NR612 shown below will hold roughly one can of media and is well suited for heavy loaded aquariums up to 300 gallons.

Category: Tags: , , , Product ID: 1746


Nitrate reactors and calcium reactor share much of the same build, the main differences being the construction of the manifold and lid along with filter pads to separate the media.

Any size calcium reactor listed can be fabricated to use the LSM sulfur media and the prices are the same as the comparable calcium reactor.

Reactors are sized according to chamber size; the first number being the diameter of the tube and the the second set of numbers being the height.

Pictured is our NR612 nitrate reactor. The chamber is 6″ in diameter and 12″ tall, the pump used for this model is the Sicce Syncra 1.5

The NR612 are in stock. Other sizes are custom orders and may take up to 2 weeks to ship.


  • All cell cast acrylic construction
  • 6″ diameter reaction chamber
  • 11″ x 10″ foot print, 18″ overall height
  • 3/8” thick lid, flange and base
  • Silicone o-ring
  • Key hole slot for lid removal
  • Full access to the reaction chamber
  • Micro ball valve effluent control
  • External Sicce Syncra 1.5 pump, bolts to base plate
  • New lid with removable screen
  • filter pads included to divide the laylers of media.
  • Output effluent on lid with push to connect fitting.
  • Input feed water on manifold with push to connect fitting.
  • 4ft of tubing provided with feed pump harness.
  • Media NOT included
  • Will hold up to 8 pounds of media


1 review for GEO NR612 Nitrate Reducing Sulfur Reactor

  1. Ryan Browne (verified owner)

    The GEO Nitrate Reactor is a fantastic addition to your tank. It has helped me reduce Nitrates to undetectable levels. There are a couple of things I did to make it very easy to use. The first thing I did was buy a precision needle valve to replace the small plastic one that comes with it. The second thing I did was to MIX Sulfur pellets with calcium media. Mixing them together increased the flow inside the chamber. If you put separate layers of sulfur and calcium media, you will run into flow issue and get tons of micro bubble. Hopefully GEO will add this to their instruction manual.

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