There are many other salt blends on the market, that emphasize that they are CMA (calcium magnesium acetate).

The small amount of CMA contained in those products (some only 1-2%), render it ineffective in stopping corrosion.

Many lab tests have shown that CMA is an effective corrosion inhibiter when combined with chlorides such as salt. Tests show that a minimum of 20% CMA is required in a salt blend to provide acceptable corrosion protection.

A 20% CMA, and 80% rock salt blend was shown to provide a 70-80% reduction in corrosion. SubZero 20 is a special blend that is even more effective in corrosion prevention, and at a lower cost.

Read labels closely... a blend with a very small amount of CMA is ineffective at corrosion prevention, and what you are buying is basically - rock salt, and it will perform just like standard rock salt.

Check prices... CMA is a specialized de-icer, that is not the cheapest price-wise. If you are comparing de-icers and finding very low prices on any ice melter that claims to contain CMA, you can bet that the amount is 1-5% and will not contain any benefit. The safest for corrosion, concrete, and vegetation is 100% CMA.