Index: firmware/App/Services/PIControllers.h
===================================================================
diff -u -r5e8f96e11c797bddeddfc009c87f20df3b7a8664 -rd32847d87534b3273deb7362f598aba60877e7b8
--- firmware/App/Services/PIControllers.h	(.../PIControllers.h)	(revision 5e8f96e11c797bddeddfc009c87f20df3b7a8664)
+++ firmware/App/Services/PIControllers.h	(.../PIControllers.h)	(revision d32847d87534b3273deb7362f598aba60877e7b8)
@@ -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 reservoir volume
     NUM_OF_PI_CONTROLLERS_IDS                       ///< Number of PI controllers
 } PI_CONTROLLER_ID_T;