CaribSea ARM Extra Coarse Calcium Reactor Media – 1 Gallon

CaribSea ARM Extra Coarse Calcium Reactor Media

Complete Mineral Replenishment for Reef Aquariums

CaribSea ARM Extra Coarse is a premium aragonite-based calcium reactor media designed to replenish calcium, carbonate alkalinity and naturally occurring trace elements in marine reef aquariums.

As CO₂ lowers the pH inside a calcium reactor, the media gradually dissolves, releasing essential minerals used by SPS, LPS, coralline algae and other calcifying organisms.

Key Features & Benefits

• Extra-coarse granules – Help maintain water flow and reduce media compaction.

• Calcium and alkalinity replenishment – Supports ongoing coral calcification.

• Natural trace elements – Contains strontium, magnesium and potassium.

• High-purity aragonite – Selected for calcium reactor applications.

• Low phosphate and silicate content – Helps minimise unwanted impurities.

• Efficient CO₂ penetration – Graded media encourages circulation through the reactor.

• Ready to use – Manufacturer-processed media requiring no pre-rinsing.

Typical Mineral Composition

According to CaribSea:

• Calcium: 416,000 ppm

• Carbonate: 577,000 ppm

• Strontium: 3,300 ppm

• Magnesium: 1,400 ppm

• Potassium: 56 ppm

These figures describe the dry media composition, not the resulting aquarium water concentrations.

How to Use

1. Add the required quantity to a compatible calcium reactor.

2. Set water flow and CO₂ dosing according to your reactor manufacturer's instructions.

3. Adjust reactor operation to maintain your aquarium's target alkalinity.

4. Regularly monitor calcium, KH and magnesium.

5. Top up or replace the media as it dissolves.

Why Choose ARM Extra Coarse?

The larger particle size makes this media particularly suitable for reef keepers seeking reliable circulation, reduced clogging and straightforward calcium reactor maintenance.

CaribSea ARM Extra Coarse – dependable mineral replenishment for demanding reef systems.