Oxy DOWFLAKE Calcium Chloride Flakes, 20 kg bags improve safety for drivers and pedestrians by treating roads, parking lots, driveways and walkways with DOWFLAKE Xtra 83-87% Calcium Chloride.  With 10% more calcium chloride than other conventional 77% assay flake products, DOWFLAKE Xtra is concentrated, so it works faster and you can apply less.