Index: firmware/App/Services/PIControllers.h
===================================================================
diff -u -r1e044a958c655d09fed725cfbc9808319b642d13 -r92eb8fea402c19b6d250651f9e11b088c6d9efd1
--- firmware/App/Services/PIControllers.h	(.../PIControllers.h)	(revision 1e044a958c655d09fed725cfbc9808319b642d13)
+++ firmware/App/Services/PIControllers.h	(.../PIControllers.h)	(revision 92eb8fea402c19b6d250651f9e11b088c6d9efd1)
@@ -33,7 +33,8 @@
 typedef enum ControllerList
 {
     PI_CONTROLLER_ID_RO_PUMP = 0,                   ///< RO Pump controller.
-    P_CONTROLLER_ID_RO_PUMP_RAMP_UP,                ///< RO Pump controller during ramp up time
+    P_CONTROLLER_ID_RO_PUMP_RAMP_UP,                ///< RO Pump controller during ramp up time.
+    PI_CONTROLLER_ID_DRAIN_PUMP,                    ///< Drain Pump controller.
     PI_CONTROLLER_ID_PRIMARY_HEATER,                ///< Primary Heater controller.
     PI_CONTROLLER_ID_TRIMMER_HEATER,                ///< Trimmer Heater controller.
     NUM_OF_PI_CONTROLLERS_IDS                       ///< Number of PI controllers.