The Portacool PARPACHWTB00 Hard Water Treatment Kit, Four (4) applications per kit, is specially formulated to keep your Portacool portable evaporative cooler running efficiently. Use as directed. Portacool portable evaporative coolers entered the marketplace in 1990 offering the first version of an evaporative cooler designed to provide economical, effective cooling where ever it was needed. More than twenty-five years later, the company’s consistent growth rate and continued expansion in product lines has positioned it as a global leader in the portable evaporative cooling business. Portacool — When Comfort Counts.