The ION Director® (IOND) applies cutting-edge ion-selective technology to precisely and economically gauge essential water parameters - Ca, Mg, K, Na, NO3 - with minimal effort. No reagents are needed; it utilizes cost-efficient reference liquids for automated calibrations. It renders inaccurate, laborious, and pricey measuring methods - e.g. test kits - obsolete. Other features include control, monitoring, analysis. The ION Director®, along with the KH Director®, monitors and regulates KH and other values. The IOND is an accessory device requiring a GHL Doser 2 Standalone or ProfiLux Controller with GHL Doser 2 Slave to operate. It uses three pump heads to perform the measurement. After a measurement, the system adjusts the dose based on the deviation of the actual value from the target (setpoint). Two adjustable control modes are available: Add-On and Adaptive.