CMS Group Inc. is a Canadian company located in Concord, Ontario. Since 1974, CMS has been involved in the design, development and manufacture of Rotating Biological Contactors (RBCs) and has registered several patents for these and other waste treatment systems.

From its original ROTORDISK® designed for single family homes, CMS has developed a complete line of treatment systems for a wide variety of wastewater applications. CMS focuses on providing practical and cost-effective solutions to wastewater treatment, air and water pollution control problems.

CMS has produced systems which have met regulatory requirements in many jurisdictions. From domestic sewage, to complex industrial wastes such as landfill leachates, CMS has been able to design and build efficient pollution control systems that treat various types of wastewater to stringent effluent limits.