Zeolite Water Treatment in a Large Central Heating Plant presents a study on zeolite water treatment in the Beacon Street heating plant of The Detroit Edison Company, as presented at the 1927 American Water Works Association convention. It outlines the department's establishment in 1920, detailing its organization and technical services addressing significant industrial problems. The main focus is implementing a zeolite water-treatment system to produce nearly scale-free water, enhancing boiler efficiency and preventing overheating and tube failure. It discusses laboratory investigations into removing carbon dioxide from zeolite-treated water using sulphuric and phosphoric acids, presenting experimental data and operational results. The text details the choice of treatment system, reasons for acid treatment, experimental methods, outcomes, acid feeding system, continuous blow-down techniques, and the overall impact on boiler performance. It highlights the benefits of using phosphoric acid to reduce carbon dioxide content and caustic alkalinity. The publication concludes with successful operational experiences and implications for future water treatment processes.