Index: firmware/App/Services/PIControllers.h
===================================================================
diff -u -ra9315539f527b92523b1598ff91e47db4d71dae2 -rd8686d68bf29761ee329fc638264d2e60a5191c0
--- firmware/App/Services/PIControllers.h	(.../PIControllers.h)	(revision a9315539f527b92523b1598ff91e47db4d71dae2)
+++ firmware/App/Services/PIControllers.h	(.../PIControllers.h)	(revision d8686d68bf29761ee329fc638264d2e60a5191c0)
@@ -36,6 +36,7 @@
     PI_CONTROLLER_ID_RO_PUMP_FLOW = 0,              ///< RO Pump controller to flow
     PI_CONTROLLER_ID_DRAIN_PUMP,                    ///< Drain Pump controller
     PI_CONTROLLER_ID_RO_PUMP_MAX_PRES,              ///< RO pump controller to maximum pressure
+    PI_CONTROLLER_ID_DRAIN_PUMP_VOLUME,             ///< Drain pump controller using tank volume
     NUM_OF_PI_CONTROLLERS_IDS                       ///< Number of PI controllers
 } PI_CONTROLLER_ID_T;