Index: firmware/App/Modes/TreatmentRecirc.c
===================================================================
diff -u -rc021768acf8408116a87585e21c2237713d6c825 -r685e17a553a4fdf7dd8b3715e95d151eeff3c866
--- firmware/App/Modes/TreatmentRecirc.c	(.../TreatmentRecirc.c)	(revision c021768acf8408116a87585e21c2237713d6c825)
+++ firmware/App/Modes/TreatmentRecirc.c	(.../TreatmentRecirc.c)	(revision 685e17a553a4fdf7dd8b3715e95d151eeff3c866)
@@ -34,8 +34,10 @@
 
 // ********** private definitions **********
 
-/// Alarm if re-circulation is running for this much time.  TODO - finalize these times w/ Systems
+/// Maximum time allowed to be in recirculation sub-mode.
 static const U32 RECIRC_TIMEOUT               = ( ( 15 * SEC_PER_MIN * MS_PER_SECOND ) / TASK_GENERAL_INTERVAL );
+/// Warn user they need to reconnect to system and resume their treatment soon.
+static const U32 RECIRC_WARNING_TIMEOUT       = ( ( 10 * SEC_PER_MIN * MS_PER_SECOND ) / TASK_GENERAL_INTERVAL );
 /// Re-circulation status broadcast interval.
 static const U32 RECIRC_DATA_PUBLISH_INTERVAL = ( MS_PER_SECOND / TASK_GENERAL_INTERVAL );
 /// Target flow rate for re-circulation of saline on blood-side circuit.
@@ -47,6 +49,7 @@
 
 static U32  recircTimerCtr;                                                 ///< Timer counter (in GP task intervals) counts time spent in re-circulation sub-mode.
 static U32  recircPublishTimerCtr;                                          ///< Timer counter (in GP task intervals) counts time to next status broadcast.
+static BOOL recircTimeoutWarningGiven;                                      ///< Flag indicates 10 minute warning has been given to user.
 
 static BOOL recircReconnectRequested;                                       ///< Flag indicates user requesting re-circulate stop so they can re-connect.
 static BOOL recircBackToTreatmenRequested;                                  ///< Flag indicates user requesting to go back to treatment (confirming re-connected).
@@ -84,6 +87,7 @@
     recircTimerCtr = 0;
     recircPublishTimerCtr = 0;
     resetTreatmentRecircFlags();
+    recircTimeoutWarningGiven = FALSE;
 }
 
 /*********************************************************************//**
@@ -238,6 +242,11 @@
         signalGoToTreatmentStopped();
         activateAlarmNoData( ALARM_ID_TREATMENT_RECIRC_TIMEOUT_ALARM );
     }
+    else if ( ( recircTimeoutWarningGiven != TRUE ) && ( recircTimerCtr > RECIRC_WARNING_TIMEOUT ) )
+    {
+        recircTimeoutWarningGiven = TRUE;
+        activateAlarmNoData( ALARM_ID_HD_TREATMENT_RECIRC_TIMEOUT_WARNING );
+    }
 
     return result;
 }
@@ -276,6 +285,11 @@
         signalGoToTreatmentStopped();
         activateAlarmNoData( ALARM_ID_TREATMENT_RECIRC_TIMEOUT_ALARM );
     }
+    else if ( ( recircTimeoutWarningGiven != TRUE ) && ( recircTimerCtr > RECIRC_WARNING_TIMEOUT ) )
+    {
+        recircTimeoutWarningGiven = TRUE;
+        activateAlarmNoData( ALARM_ID_HD_TREATMENT_RECIRC_TIMEOUT_WARNING );
+    }
 
     return result;
 }