Pentair Semi-Auto Controller for 04 Tank System

The Pentair Stark™ CS400™ Commercial Semi-Automatic Backwash Controller for a 4-Tank System (Model CS400-04) is a specialized, intelligent automation hub designed to manage and optimize the backwash cycle across a four-vessel commercial sand filtration layout. Engineered for high-demand public swimming pools, community water parks, and large-scale municipal aquatic centers utilizing Stark™ or THS Series® horizontal sand filters, this sophisticated control unit bridges the gap between labor-intensive manual cleaning and fully automated systems. Powered by integrated Acu-Trol® intelligence, the CS400 allows an operator to safely initiate a comprehensive, multi-stage backwash cycle across all four filter tanks at the single touch of a button, via an external signal from a master pump room controller (such as the Acu-Trol AK600), or through an optional differential pressure switch. Once triggered, the internal, motorized multiport pressure distribution valve automatically sequences the process by routing regulated city water pressure or compressed air (ideally 35 to 40 PSI) to mechanically actuate large, diaphragm-style hydraulic face-piping valves one individual tank at a time. This progressive, one-by-one execution ensures stable hydraulic balancing across the pool equipment pad, preventing sudden pressure drops while incorporating vital equipment protections—such as a built-in "Fireman's Delay" heater cool-down relay and main circulation pump interlocks to prevent mechanical cavitation, water hammer, or thermal shock. The hardware is housed entirely within a heavy-duty, weather-resistant, and NEMA-rated non-corrosive enclosure built to survive the humid, chemical-laden environments of commercial mechanical rooms, and it features an intuitive, backlit LCD display alongside dedicated LED status indicators for real-time monitoring of saved backwash history logs and diagnostic alarms. The dry product weight of the Pentair CS400-04 Semi-Automatic Backwash Controller is approximately 25 pounds (with a packaged shipping weight of roughly 26 pounds including the integrated internal pressure regulators, plumbing check valves, and universal mounting hardware), providing commercial water managers with an incredibly dependable, water-conserving, and high-tech fluid-management solution.