Polar Plus Ice Melter, 20 kilogram bag. Effective to -22ºC: Contains Calcium Chloride – the best Ice Melter ingredient – best combination of speed and duration in ice melting. Generates heat and brine quickly for a synergistic effect to make other ingredients perform better and improves effective temperature of Polar Plus to -22ºC. Safe to use: is used extensively in the environment by highways departments for de-icing and dust control (gravel roads); is used as fertilizer in agriculture, and as a food additive – a safe and proven ingredient. Green Marker Dye Improves Visibility for Spreading Green soluble marker: Dye shows were product is applied and reduces over-application. Dye is applied using a Calcium Chloride Brine carrier – Calcium Chloride coats each granule to improve effectiveness of the overall blend – a technique used by highways departments to improve the performance of road salt. Safe with Vegetation, Concrete when used as directed.