Pentair SunTouch® 520856 Solar Control System with 3-Way Valve. SunTouch® control system is the easy way to keep your pool and spa clean, comfortable, and ready to enjoy. With the touch of a few buttons, you can quickly program your pool and spa filtration and heating cycles to fit your schedule. And its just as simple to change programs or switch to manual mode for those unplanned, spontaneous plunges. With SunTouch®, your pump and heater automatically run whenever you want, for as long as you want so your pool and spa are always warm and inviting. In addition to controlling your pump and heater, the standard SunTouch® package has the ability to schedule operation of additional functions, such as your lights or automatic cleaner. You can also add a third valve actuator to automate a solar heating system or water feature.