Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r3ee7155720dd102ca0dc22102246285728d6068d -r633c1875dade18cae4a28eb9ea4787da441a7f48
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 3ee7155720dd102ca0dc22102246285728d6068d)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 633c1875dade18cae4a28eb9ea4787da441a7f48)
@@ -39,7 +39,7 @@
 #define MAX_PRIME_TIME                                      ( 15 * SEC_PER_MIN )                               ///< Maximum prime time (in seconds).
 #define PRIME_DATA_PUB_INTERVAL                             ( MS_PER_SECOND / TASK_GENERAL_INTERVAL )          ///< Interval (ms/task time) at which the prime data is published on the CAN bus.
 
-#define BLOOD_PUMP_FAST_FLOW_RATE_PURGE_AIR_ML_MIN          150                                                ///< Blood pump fast flow rate to fill fluid.
+#define BLOOD_PUMP_FAST_FLOW_RATE_PURGE_AIR_ML_MIN          300                                                ///< Blood pump fast flow rate to fill fluid.
 #define BLOOD_PUMP_SLOW_FLOW_RATE_PURGE_AIR_ML_MIN          150                                                ///< Blood pump slow flow rate after fluid reach lower level of air trap sensor.
 #define BLOOD_PUMP_SALINE_FLOW_RATE_PURGE_AIR_ML_MIN        200                                                ///< Blood pump very slow flow rate during prime saline dialyzer state
 #define BLOOD_PUMP_FLOW_RATE_CIRC_BLOOD_CIRCUIT_ML_MIN      150                                                ///< Blood pump flow rate during prime recirculate blood circuit state.
@@ -101,6 +101,7 @@
 
 static BOOL primeStartRequested;                                ///< Flag indicates user requesting to start prime.
 static BOOL primeResumeRequested;                               ///< Flag indicates user requesting prime resume.
+static BOOL primeFirstPurgePass;                                ///< Flag indicates to transition to a faster purge speed.
 
 static U32 noAirDetectedStartTime;                              ///< starting time when detecting no air.
 static U32 purgeAirTimeOutStartTime;                            ///< Starting time for purge air state time out.
@@ -161,6 +162,7 @@
 void transitionToPrime( void )
 {
     primeStartTime = getMSTimerCount();
+    primeFirstPurgePass = TRUE;
 
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RESUME, TRUE );
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RINSEBACK, FALSE );
@@ -426,7 +428,14 @@
 
     signalDialOutPumpHardStop();
     signalDialInPumpHardStop();
-    setBloodPumpTargetFlowRate( BLOOD_PUMP_FAST_FLOW_RATE_PURGE_AIR_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+    if (FALSE == primeFirstPurgePass )
+    {
+        setBloodPumpTargetFlowRate( BLOOD_PUMP_FAST_FLOW_RATE_PURGE_AIR_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+    }
+    else
+    {
+        setBloodPumpTargetFlowRate( BLOOD_PUMP_SLOW_FLOW_RATE_PURGE_AIR_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+    }
 }
 
 /*********************************************************************//**
@@ -546,7 +555,12 @@
     {
         purgeAirValvesBloodPumpControl();
         purgeAirTimeOutStartTime = getMSTimerCount();
+        if ( TRUE == primeFirstPurgePass )
+        {
+            primeFirstPurgePass = FALSE;
+        }
         state = HD_PRIME_SALINE_PURGE_AIR_STATE;
+
     }
 
     if ( TRUE == didTimeout( noAirDetectedStartTime, NO_AIR_DETECTED_COUNT ) )