This manual investigates the core mathematical competencies required for the effective operation and management of water and wastewater treatment facilities. Author Frank R. Spellman, a recognized expert in environmental science and safety, provides a structured framework designed to bridge the gap between theoretical arithmetic and practical plant application. The text utilizes a tiered approach, moving from foundational numerical concepts to complex operational calculations, ensuring that practitioners can accurately monitor and maintain treatment systems.

Experts and industry professionals frequently cite this manual as a foundational reference for operators preparing for certification examinations. Readers often note the practical utility of the workbook section, which provides necessary reinforcement for the technical concepts presented in the earlier chapters.