Since 1953, RainSoft has provided water-treatment systems for homes. The company s product line includes water-conditioning systems, drinking water systems and problem-solving filters. RainSoft started with one location in Bensenville, Ill. A division of Aquion Water Treatment Products, RainSoft is an international company with nearly 300 dealers in the United States and 24 other countries. Headquartered in Elk Grove Village, Ill., RainSoft has a location in Charlotte, N.C.