Incl. Solar control and backwash control. Filter control for 230V or 400V pump with automatic backwash, heating controller and solar controller with priority for the sun. Remote control via cable or modem, SMS error dispatch, protection functions, directly connectable piston valves for filter backwashing, universal input, waterproof housing with transparent cover, etc. Just like the iQntrol-P5, the iQntrol-P4 has integrated the automatic backwash, since all the electronics are in the controller you just need an Aquastar MP6 plc and the right cable (both not included in the control).