Compass Minerals to Increase Prices on Magnesium Chloride-Based Roadway Maintenance Products – North American Salt Company and Sifto Canada Corp., subsidiaries of Compass Minerals (NYSE: CMP), will increase prices on liquid magnesium chloride-based roadway maintenance products by an average of $6 per short ton, or 15 percent to 30 percent, effective with shipments to all U.S. and Canadian customers on August 1, 2008.