Calcium Chloride vs Magnesium Chloride: Best Ice Melt for Driveways
Calcium Chloride is a hygroscopic salt that melts ice faster and works at lower temperatures. Magnesium Chloride is another salt-based de-icer that’s gentler on concrete and plants but slightly slower.
People often grab whichever bag is cheapest or labeled “pet-safe,” assuming all salts are equal. In reality, one clears thick ice quickly, while the other tries to spare your lawn and driveway from pitting.
Key Differences
Calcium Chloride pulls moisture from the air, creating heat and melting ice fast. Magnesium Chloride releases less heat and focuses on preventing refreeze. The first is more aggressive; the second is milder for surfaces.
Which One Should You Choose?
Need speed on a steep driveway? Pick Calcium Chloride. Worried about concrete spalling or nearby greenery? Opt for Magnesium Chloride. For many, the choice is simply: speed versus surface care.
Can I mix both salts?
Yes, but blending won’t create a super product; you’ll just split the difference in speed and safety.
Will either salt kill grass?
Excess of any salt stresses grass; magnesium is usually less harsh, yet both need light application.
Do I need to shovel first?
Yes, clear loose snow so the salt can reach the ice layer and work efficiently.