July 17, 2008

Compass Minerals Announces Price Increase on Sulfate of Potash Specialty Fertilizer

Great Salt Lake Minerals Corp., a subsidiary of Compass Minerals (NYSE: CMP), has announced a $255 per-ton price increase on all sulfate of potash (SOP) specialty fertilizer products effective with shipments on August 15, 2008. The new list price for standard, non-granulated SOP will be $988 per short ton and granular SOP will be $1000 per short ton at the company's solar evaporation plant at Ogden, Utah. A price list for Great Salt Lakes Minerals' SOP products is posted on its website at www.gslminerals.com.

About Compass Minerals

Based in the Kansas City metropolitan area, Compass Minerals is a leading producer of inorganic minerals, including salt, sulfate of potash specialty fertilizer and magnesium chloride. The company provides highway deicing salt to customers in North America and the United Kingdom and specialty fertilizer to growers worldwide. Compass Minerals also produces and distributes consumer deicing and water conditioning products, ingredients used in consumer and commercial foods, and other mineral-based products for consumer, agricultural and industrial applications. Compass Minerals also provides records management services to businesses throughout the U.K.

This press release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are based on the Company's current expectations and involve risks and uncertainties that could cause the Company's actual results to differ materially. The differences could be caused by a number of factors including those factors identified in Compass Minerals International's annual report on Form 10-K filed with the Securities and Exchange Commission on February 22, 2008. The Company undertakes no obligation to update any forward-looking statements made in this press release to reflect future events or developments.