---
product_id: 11450205
title: "CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth"
brand: "carib sea"
price: "€ 131.58"
currency: EUR
in_stock: true
reviews_count: 9
url: https://www.desertcart.sk/products/11450205-caribsea-arm-reactor-coarse-filter-media-for-aquarium-1-gallon
store_origin: SK
region: Slovakia
---

# Optimized for rapid upflow reactors 416,000 ppm Calcium Coarse grade prevents clogging CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth

**Brand:** carib sea
**Price:** € 131.58
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate your reef game with premium ARM Coarse Filter Media!

## Quick Answers

- **What is this?** CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth by carib sea
- **How much does it cost?** € 131.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/11450205-caribsea-arm-reactor-coarse-filter-media-for-aquarium-1-gallon)

## Best For

- carib sea enthusiasts

## Why This Product

- Trusted carib sea brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Lasting Media:** Durable 1-gallon supply built to sustain your aquarium’s ecosystem
- • **Clog-Free Efficiency:** Coarse media design ensures smooth, low-maintenance reactor operation
- • **Coral Health Catalyst:** Rich in calcium, carbonate, and magnesium to stabilize and enhance reef tanks
- • **Upflow Reactor Optimized:** Specifically engineered for rapid upflow reactors to maximize performance
- • **Magnesium-Powered Reef Boost:** High magnesium aragonite formula fuels vibrant coral growth

## Overview

CaribSea ARM Reactor Coarse Filter Media delivers a high magnesium aragonite formula with 416,000 ppm calcium and 577,000 ppm carbonate, designed to prevent clogging and optimize rapid upflow calcium reactors. This 1-gallon media supports robust coral growth and reef stability, making it an essential upgrade for professional reef aquarists seeking efficient, durable filtration.

## Description

Full description not available

## Features

- High magnesium aragonite formula: ARM Coarse media is designed with high magnesium content, providing optimal conditions for calcium reactors.
- Prevents clogging: The coarse grade prevents clogging and reduces maintenance associated with fine media, ensuring smooth reactor operation.
- Ideal for upflow reactors: Perfect for rapid upflow type reactors, ARM Coarse enhances reactor efficiency and simplifies tank upkeep.
- Supports coral growth: With high calcium, carbonate, and magnesium content, this media promotes coral health and enhances reef tank stability.
- Efficient and durable: ARM Coarse media is designed to last, offering 416,000 ppm calcium, 577,000 ppm carbonate, and 1 gallon of media per unit.

## Images

![CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth - Image 1](https://m.media-amazon.com/images/I/71K9ViZr75L.jpg)
![CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth - Image 2](https://m.media-amazon.com/images/I/A1eYyiM+2kL.jpg)
![CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth - Image 3](https://m.media-amazon.com/images/I/91vr9+UdjNL.jpg)
![CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth - Image 4](https://m.media-amazon.com/images/I/91I4Vh7lCGL.jpg)
![CaribSea ARM Reactor Coarse Filter Media for Aquarium – 1 Gallon – High Magnesium Aragonite Formula – Ideal for All Calcium Reactors – Supports Coral Growth - Image 5](https://m.media-amazon.com/images/I/91q1cl7vXOL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
    Excelente
  
  

*by A***Z on Reviewed in the United States on July 8, 2021*

El mejor producto

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works perfect on my full sps setup
  

*by D***D on Reviewed in the United States on December 27, 2016*

The is the only cal rx media I use. Works perfect on my full sps setup. Pair it with a quality calcium reactor and you are set.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Quality Aragonite!
  

*by R***9 on Reviewed in the United States on July 15, 2017*

Got it earlier today. Perfect sized aragonite, will be using it as sand bed for my mushroom boxes!

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**Shop now:** [https://www.desertcart.sk/products/11450205-caribsea-arm-reactor-coarse-filter-media-for-aquarium-1-gallon](https://www.desertcart.sk/products/11450205-caribsea-arm-reactor-coarse-filter-media-for-aquarium-1-gallon)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-05*