Caribsea ARM Reactor Media
Caribsea ARM Reactor Media 3.8L is used as a complete solution for calcium reactors, providing calcium, carbonate, and essential trace elements with high solubility and low phosphate content.
CaribSea ARM Extra 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 that includes both calcium and carbonate as well as essential trace elements.
The media comes in three forms Small, Coarse, and Extra Coarse.
- Small – Provides the most surface area which maximizes the amount of calcium and carbonate that can be added to the tank. *The small size can clog many reactors and may require ongoing maintenance.
- 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.
Size: 3.8L
When can I expect delivery?
- Gauteng (Jhb/Pta) - 2-3 working days
- Nationwide (Cpt/Dbn+) - 2-5 working days
- Outlying Areas - 3-7 working days
All orders are sent via Economy Road 🐌 typically through Internet Express Couriers. Estimated timeframes are not guaranteed. Once the order is collected by the courier, we have no control over third-party logistics and cannot make any time promises.
If you prefer a faster 🚀 shipping option, we also offer The Courier Guy during checkout in the dropdown selection. Please note that this option is not free, and you must choose it to use it. Please pay careful attention to the cutoff times and delivery timeframe for these options during checkout.
No more waiting at home or work for deliveries! ⏰ Now you can pick up your orders from a locker or counter location while you continue with your day. Depending on your location, delivery times to a Bob Box Locker can take between 3 to 7 working days!* Please note that once the parcel is deposited in the locker, you have 2 days to pick it up. If you fail to do so, it will be returned to the sender, and additional shipping fees will apply to resend your order.


