Not all white pellets in a bag are the same. The types of ice melt used in professional snow removal differ wildly in working temperature, cost, speed, and what they do to concrete, plants, and pets. Here’s what contractors actually spread — and when each product is the right call.
Rock Salt (Sodium Chloride)
The workhorse. Cheap, abundant, and effective down to about 15–20°F.
Pros: By far the lowest cost per pound; melts fast in moderate cold; easy to source in bulk.
Cons: Nearly useless below 15°F; corrosive to metal, damaging to concrete (especially newer pours), harsh on grass, plants, and pets’ paws; chloride runoff harms waterways.
Best use: Roads and big commercial lots in moderate winter climates where volume and price rule.
Calcium Chloride
The cold-weather champion. Works down to roughly -25°F and generates heat as it dissolves, melting ice faster than anything else on this list.
Pros: Fastest acting; effective in extreme cold; works at lower application rates than rock salt.
Cons: 2–4x the price of rock salt; can leave slippery residue if over-applied; still corrosive; can irritate skin — crews should wear gloves.
Best use: Deep-cold snaps, high-priority walkways and entrances, and anywhere speed matters.
Magnesium Chloride
The middle path. Effective to about -10°F and noticeably gentler than rock salt or calcium chloride.
Pros: Less damaging to concrete and vegetation; safer around pets than the chlorides above; works fast; often applied as liquid pre-treatment.
Cons: Costs more than rock salt; needs heavier application than calcium chloride for the same result.
Best use: Properties where owners care about landscaping, pets, and pavement — a common “premium service” upsell.
Potassium Chloride
A milder option effective only to about 20°F. Gentler on plants (it’s literally a fertilizer component), but slow, expensive for what it does, and weak in real cold. Usually found blended with other melters rather than used alone.
Calcium Magnesium Acetate (CMA)
The premium, chloride-free choice. Salt-free, biodegradable, and the least corrosive option — which is why it’s specified for parking garages, LEED buildings, bridges, and new concrete.
Cons: Very expensive, works slowly, and performs best above ~20°F. It prevents ice from bonding to pavement more than it melts existing ice.
Best use: Corrosion-sensitive infrastructure and environmentally restricted sites.
Liquid Brine & Pre-Treatment
Increasingly, pros spray salt brine (often blended with calcium or magnesium chloride) before a storm. Pre-treatment prevents ice from bonding to pavement, cuts total salt use by up to 30%, and makes post-storm clearing dramatically easier. If your snow contractor offers pre-treatment, that’s a sign of a serious operation.
Quick Comparison Table
| Product | Effective To | Speed | Relative Cost | Concrete/Plant Safety |
|---|---|---|---|---|
| Rock salt | 15–20°F | Moderate | $ | Poor |
| Calcium chloride | -25°F | Fastest | $$$ | Poor–Fair |
| Magnesium chloride | -10°F | Fast | $$ | Fair–Good |
| Potassium chloride | 20°F | Slow | $$ | Good |
| CMA | ~20°F | Slow | $$$$ | Best |
| Liquid brine (pre-treat) | Varies by blend | Preventive | $–$$ | Good (less total salt) |
Application Tips That Save Money and Pavement
More is not better — over-salting wastes product and accelerates concrete damage. Calibrate spreaders, sweep up excess after melt-off, avoid any chloride product on concrete less than a year old, and keep pet-safe blends (typically magnesium-based) for residential walkways.
Ice management is half of professional snow work — the plowing is the other half. See our guides to commercial snow removal contracts and the best snow plow brands for the rest of the operation.