Affordable. Convenient. Easy to Use. Delivers complete pool/spa control in one simple device. This affordable and convenient device delivers complete pool/spa control. The AquaLink Z4 provides easy‐to‐use automation for up to four circuits and three valve actuators. Energy Efficient 4-Function Pool/Spa Automation: Easy installation and intuitive set‐up Compact, in‐wall design Convenient and easy to use on‐board interface Four relays control filter pumps, and up to three auxiliary circuits, such as booster pumps, water features, color lights, etc. Controls up to three valve actuators Spill‐over and solar priority functionality built‐in