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Calcium Reactors & Reactor Media
Keep your reef tank thriving with our selection of calcium reactors and reactor media — essential tools for maintaining optimal calcium and alkalinity levels in saltwater aquariums. These systems automate the process of replenishing critical minerals, promoting healthy coral growth and a stable marine environment.

What is a Calcium Reactor and How Does It Work?
A calcium reactor is a device that dissolves calcium carbonate media by introducing CO2 into a reaction chamber filled with the media. As the CO2 lowers the pH inside the chamber, the media slowly dissolves, releasing calcium, carbonate, and other trace elements into the aquarium water. This continuous process maintains balanced calcium and alkalinity levels, reducing the need for manual dosing.

Benefits of Using a Calcium Reactor:
Consistent water chemistry: Automates calcium and alkalinity supplementation, preventing fluctuations that can stress corals.
Supports coral growth: Provides a steady supply of dissolved calcium and trace elements for strong coral skeleton development.
Long-term cost efficiency: While the initial setup may be an investment, a calcium reactor reduces the need for frequent liquid dosing and manual adjustments.

Choosing the Right Reactor Media:
Selecting high-quality reactor media is crucial for your system’s effectiveness. Consider the following options:

Aragonite media: Rich in calcium and magnesium, ideal for most reef tanks.
Coarse or fine media: Coarse media dissolves slower and is less prone to clogging, while fine media dissolves faster but may require more frequent maintenance.
Blended media: Combines different types of carbonate sources, offering a broader range of trace elements.

Tips for Using Calcium Reactors:
Monitor pH levels: Keep the pH inside the reactor around 6.5–6.8 to ensure proper dissolution of the media.
Calibrate your CO2: Use a bubble counter and pH probe to fine-tune CO2 input — too much can lower tank pH, while too little may leave corals lacking calcium.
Regular maintenance: Clean the reactor pump and check for clogs in the media to maintain consistent flow.
Test water parameters: Even with a reactor, regularly test calcium, alkalinity, and magnesium levels to ensure balance.

Whether you’re starting with your first calcium reactor or looking to upgrade your media, our range of products will help you create the ideal environment for your reef’s health and vibrancy.