1 Gallon ARM Reactor Media - Coarse

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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 means the lowest phosphate content (less than 1/10th of 1ppm)
  • 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 008479005298
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Product Questions

What is the rough average size for the coarse and extra coarse media?
Question by: Matthew Stachler on Oct 8, 2017, 8:40 PM
Hey there,
Thanks for getting in touch with us in regards to sizing for these medias. The coarse media I measured was about 0.25-.5" with more on the .5" end. For the extra coarse, I measured them at 1-1.5" with more on the 1" side. Please let me know if there is anything else that we can assist with. Thanks!
Answer by: Tyler Schafer on Oct 15, 2017, 10:05 AM
About what volume in liters is This? I have a dual chamber reactor and require about 11-12 liters of media.
Thank you, Mike
Question by: Mike cline on Feb 16, 2017, 12:26 PM
Hey there,
Caribsea ARM media is sold by volume and comes in 1 gallon containers, which would convert to a bit less than 4 liters.

Have a great day!
Answer by: Zack on Feb 17, 2017, 3:32 PM
I could not find the weight of this product. What amount of media comes in the container?

Thanks Glenn
Question by: Glenn Relethford on Nov 27, 2015, 3:33 PM
Great question!
This will weight 8 lbs. Feel free to let us know if you have any further questions!
Answer by: Connor on Nov 29, 2015, 10:23 AM