Pentair Semi-Automatic Backwash Controller for 03 Tank System

The Pentair Stark™ CS400™ Commercial Semi-Automatic Backwash Controller for a 3-Tank System (Model CS400-03) is an advanced, industrial-grade multi-vessel automation hub specifically custom-engineered to manage the high-volume sequential backwashing of three-vessel commercial sand filtration configurations. Designed for mid-to-large scale public swimming pools, community water parks, and municipal aquatic centers utilizing Stark™ or THS Series® horizontal sand filters, this sophisticated control unit eliminates the intense labor, critical timing errors, and physical risks associated with manually operating multi-tank filter batteries. Powered by integrated Acu-Trol® intelligence, the CS400 allows facility operators to safely initiate a comprehensive, multi-stage backwash cycle across all three filter vessels at the single touch of a button, via a programmed external signal from a master room controller (such as the Acu-Trol AK600), or through an optional differential pressure switch. Once triggered, the unit's internal, motorized multiport pressure distribution valve automatically sequences the entire process, routing regulated city water pressure or compressed air (ideally 35 to 40 PSI) to mechanically actuate the 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 commercial pump room, preventing sudden pressure drops while incorporating critical equipment safeguards—such as a built-in "Fireman's Delay" heater cool-down relay and main circulation pump interlocks to prevent catastrophic mechanical cavitation, water hammer, or thermal shock. The hardware is housed entirely within a heavy-duty, weather-resistant, and NEMA-rated non-corrosive enclosure engineered to withstand humid, chemical-laden environments, and it features an intuitive, backlit LCD status display alongside dedicated LED indicators for real-time monitoring of saved backwash history logs and diagnostic alarms. The dry product weight of the Pentair CS400-03 Semi-Automatic Backwash Controller is approximately 25 pounds (with a packaged shipping weight of roughly 26 pounds including the integrated internal pressure regulators, pneumatic plumbing lines, and universal mounting hardware), providing commercial water managers with an incredibly dependable, water-conserving, and high-tech fluid-management solution.