Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -rca238a4fc2400ffaf3c2a90c6e923a87b8dac4d2 -r53aac4a83db91120aaa4bcfc9b54c394f9e64e9a
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision ca238a4fc2400ffaf3c2a90c6e923a87b8dac4d2)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 53aac4a83db91120aaa4bcfc9b54c394f9e64e9a)
@@ -40,7 +40,6 @@
 #define MAX_PRIME_TIME                                      ( 30 * 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          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_SLOW_FLOW_RATE_CIRC_BLOOD_CIRCUIT_ML_MIN 150                                                ///< Blood pump slow flow rate during prime recirculate blood circuit state.
@@ -129,7 +128,6 @@
 
 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.
@@ -195,7 +193,6 @@
 void transitionToPrime( void )
 {
     primeStartTime = getMSTimerCount();
-    primeFirstPurgePass = TRUE;
 
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RESUME, TRUE );
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RINSEBACK, FALSE );
@@ -459,7 +456,7 @@
  * @brief
  * The purgeAirValvesBloodPumpControl function controls valves and blood pump
  * to purge air.
- * @details Inputs: primeFirstPurgePass
+ * @details Inputs: None
  * @details Outputs: run blood pump, close VDI, VDO, VBA and VBV valves, open VBT valve
  * @return current state (sub-mode)
  *************************************************************************/
@@ -473,14 +470,10 @@
 
     signalDialOutPumpHardStop();
     signalDialInPumpHardStop();
-    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 );
-    }
+
+    //Set the blood pump rate to 150 mL/min that helps to aviod entering saline bubbles in to PBo line
+    setBloodPumpTargetFlowRate( BLOOD_PUMP_SLOW_FLOW_RATE_PURGE_AIR_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+
 }
 
 /*********************************************************************//**
@@ -630,8 +623,8 @@
  * @brief
  * The handlePrimePurgeAirState function checks for air trap level and moves
  * to blood circuit circulation state if fluid is detected at upper sensor.
- * @details Inputs: air trap levels, primeFirstPurgePass, purgeAirTimeOutStartTime
- * @details Outputs: runs blood pump, control valves to trap air, primeFirstPurgePass
+ * @details Inputs: air trap levels, purgeAirTimeOutStartTime
+ * @details Outputs: runs blood pump, control valves to trap air,
  * noAirDetectedStartTime
  * @return current state
  *************************************************************************/
@@ -656,9 +649,6 @@
 
         setBloodPumpTargetFlowRate( BLOOD_PUMP_FAST_FLOW_RATE_CIRC_BLOOD_CIRCUIT_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
 
-        // Once the dialyzer is no longer dry from the first pass of purge air, we can set flow to the fast rate
-        // until we are in a new priming state.
-        primeFirstPurgePass = FALSE;
         noAirDetectedStartTime = getMSTimerCount();
         primeDialyzerBubbleClearState = PRIME_BUBBLE_CLEAR_COMPLETE_STATE;
         state = HD_PRIME_SALINE_CIRC_BLOOD_CIRCUIT_STATE;