About FritzPro Magnesium Chloride
FritzPro Magnesium Chloride is a high-quality concentrated magnesium salt designed to replenish magnesium in captive reef systems. Monitoring and maintaining proper magnesium levels is an important part of stabilizing water chemistry values, resulting in better coral, coralline algae, and invertebrate growth and health.
Being the third most abundant ion in natural seawater behind sodium and chloride, magnesium is an important ion for reef aquarists to understand and monitor. Magnesium is an essential component in many biological processes and plays a key role in calcification. In addition to its biological functions, magnesium helps stabilize the correct combination of calcium, alkalinity, and pH values.
| Specification | Value |
|---|---|
| Chemical Formula | MgCl₂ |
| Form | Crystalline Powder |
| Concentration | 35% Magnesium by weight |
| Storage | Store in a cool, dry place away from direct sunlight |
FAQ
What is the recommended dosage for FritzPro Magnesium Chloride?
Please contact customer service for specific dosage recommendations based on your tank size and current water parameters.
Can FritzPro Magnesium Chloride be used in freshwater tanks?
No, this product is specifically formulated for marine and reef aquariums and should not be used in freshwater systems.
Does FritzPro Magnesium Chloride affect pH levels?
Magnesium chloride has a minimal direct effect on pH. It primarily supports stable calcium and alkalinity levels, which indirectly help maintain balanced pH.




Penelope Lyman –
I’ve been using FritzPro Magnesium Chloride for three months now and noticed a significant improvement in coral coloration and growth. The product dissolves easily and the magnesium levels stay stable after addition. It’s a reliable supplement for my reef tank.
Jane Mackenzie –
The magnesium levels in my tank have been consistent since I started using this product. It’s easy to measure and mix. I appreciate the clear labeling and the fact that it doesn’t cause any pH spikes.
Irene Gibson –
This is the first magnesium supplement I’ve tried that actually works without causing water imbalances. My coralline algae has grown more robustly, and the invertebrates seem healthier overall.