The Hayward Residential CO2 pH Control System is designed for compatible pool water chemistry management applications. CO2-based pH control systems help adjust water balance by feeding carbon dioxide into the system rather than relying on traditional acid feed methods in supported installations.Use this system only after confirming the pool’s automation needs, feed equipment requirements, plumbing layout, and local service practices. Proper setup and calibration are important for safe, reliable water chemistry control. Residential CO2 pH control system for compatible pools Supports automated water balance management Alternative to traditional acid feed setups in supported applications Intended for professional installation and calibration Verify part number AC003 before ordering