Shovel first, then choose a deicer by the coldest pavement temperature you expect. Plain rock salt (sodium chloride) stops working in practice below about 15°F. Below that, a calcium chloride or magnesium chloride product, or a blend rated for colder pavement, does the melting. Sand never melts ice. It only adds traction. Before using any chemical on new, decorative or damaged concrete, check the installer’s care instructions.
Deicer temperature ranges
The Minnesota Pollution Control Agency (MPCA) advises picking a deicer by its lowest practical melting temperature, not the eutectic temperature often printed on the bag. Its fact sheet lists these values:
| Material | Lowest practical melting temperature |
|---|---|
| Calcium chloride | -20°F |
| Potassium acetate | -15°F |
| Magnesium chloride | -10°F |
| Sodium chloride (rock salt) | 15°F |
| Calcium magnesium acetate | 20°F |
| Blends | Check with the manufacturer |
| Sand and other abrasives | Never melts; traction only |
Salt also slows sharply as pavement gets colder. MPCA’s figures show one pound of salt melting 46.3 pounds of ice in about 5 minutes at 30°F, but only 6.3 pounds in about an hour at 15°F. At 10°F, MPCA says dry salt is ineffective and will blow away before it melts anything.
Use less and get a better surface
- Remove snow first. MPCA says deicing works best after plowing, and that deicers give no traction on top of snow and ice.
- Match the product to the pavement temperature, which can differ from the air temperature.
- Apply sparingly. MPCA warns that too high an application rate can make surfaces slippery and increase tracking. Sweep up granules left on dry pavement after the storm.
- Use sand when the job is grip, not melting. Sand works on top of snow as traction, especially when it is too cold for salt to work.
Overuse also has a lasting cost. MPCA says one teaspoon of salt permanently pollutes five gallons of water, so excess product washing into storm drains does not go away. Ice that keeps forming in the same spot often points to a downspout, grading or roof-drip problem. The downspout extension guide covers where that water should go.
One documented blend: Safe Step Enviro-Blend 6300
Compass Minerals lists Enviro-Blend 6300’s active ingredients as sodium chloride, magnesium chloride hexahydrate, potassium chloride and its MG 104 additive. The company rates it to melt ice down to -10°F. It is a chloride blend, not pure magnesium chloride. It is sold in an 11-pound jug, 25- and 50-pound bags, and a 40-pound pail.
That rating makes it a candidate for driveways that regularly drop below salt’s 15°F limit. Its “lower environmental impact” claim is the maker’s comparison with conventional deicers, so the MPCA guidance on using less still applies. We have not tested its melting speed or its effect on any surface.
New or damaged concrete
No “concrete safe” or “gentle” label replaces the installer’s care instructions for new, decorative, sealed, cracked or spalled concrete. Where those instructions rule out chemical deicers, use a plastic shovel and sand for traction. Follow the product label for any surface it excludes.
Pets, plants and storage
“Pet friendly” is a marketing phrase, not proof that a product is harmless. Keep children and pets away during application, wipe pets’ paws after walks, and keep granules off plants. Store the bag sealed, dry and out of reach. For a suspected ingestion, call a veterinarian or poison control rather than relying on the label claim.
Related guides
Sources
Checked October 3, 2026: