1 Gallon ARM Reactor Media - Extra Coarse

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$24.28 $24.28

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ARM Coarse Reactor Media contains calcium, carbonate, and trace elements.

  • Nearly 50x the Strontium of other brands (7390ppm)
  • Precision grading allows for maximum carbon dioxide penetration
  • No gastropod shells mean the lowest phosphate content (less than 1/10th of 1ppm)
  • The highest solubility of any reactor media (metastable at 8.2)


One of the most trusted media for calcium reactors in the industry. The media is a complete solution which includes both calcium and carbonate as well as essential trace elements. 


The media comes in two forms Coarse and Extra Coarse.

  • Coarse – larger size granules which are less likely to clog equipment.
  • Extra Coarse – Largest size granules and the least likely to clog equipment which results in the lowest maintenance option.


Note: All ARM media is packaged by volume in a 1-gallon container. Weights may vary from container to container, but on average one gallon will yield 8 - 10 pounds of media.

More Information
UPC 008479005311
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Product Questions

is this ok to use as rock rubble for a refugium ?
Question by: ryan on Oct 28, 2017, 6:30 PM
Sure! Many reefers use rock rubble as a refugium substrate and as habitat for things like copepods and amphipods. :-)
Answer by: Randy on Nov 25, 2017, 8:40 AM
Is the media sold by the pound? What size is your containers?
Question by: mario on Nov 25, 2013, 5:43 PM
Hey Mario,
Its sold by the container. The weight of each container is a little different depending on the size media you purchase but they are all right around 1 gallon.
Answer by: Bulk Reef Supply on Nov 25, 2013, 5:43 PM