Pentair EasyTouch® PSL4 522354 Pool and Spa Base Control System. EasyTouch PL4 and PSL4 control systems are the economical way to bring sophisticated automation capabilities to standard pools, for control over filtration pumps, lighting, chemical management and more. Like Pentair control systems with broader capabilities, EasyTouch PL4 and PSL4 control systems include an easy to use control panel built into an outdoor enclosure. Push-button controls and intuitive displays take the guesswork and frustration out of setting up and modifying control programs. The EasyTouch PL4 control system is a four-circuit system designed for a single body of water, while the EasyTouch PSL4 system is a four-circuit system designed to control a pool per spa combination. Both systems can even help you save on energy costs because with automatic scheduling, you don't have to rely on memory or limited time clocks to turn off equipment.