Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -re654b368ff8f4d194678db88f1cda57b04e7d947 -rb21d331f7b18cb2a1dacad78bd1049b31152f029
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision e654b368ff8f4d194678db88f1cda57b04e7d947)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision b21d331f7b18cb2a1dacad78bd1049b31152f029)
@@ -8,7 +8,7 @@
 * @file    Prime.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      21-Apr-2022
+* @date    (last)      26-Aug-2022
 *
 * @author  (original)  Quang Nguyen
 * @date    (original)  08-Dec-2020
@@ -38,7 +38,7 @@
 #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.
@@ -50,8 +50,8 @@
 #define DIALYZER_DVI_PATH_VOLUME_ML                          17                                                ///< Path volume from the dialyzer to the VDI valve in mL.
 #define DIALYZER_VOLUME_SCALE_FACTOR                        0.5F                                               ///< Half of the dialyzer total volume.
 
-#define NO_AIR_DETECTED_COUNT                               ( 20 * MS_PER_SECOND )                             ///< No air detected time period count.
-#define PURGE_AIR_TIME_OUT_COUNT                            ( 60 * MS_PER_SECOND )                             ///< Time period count for purge air time out.
+#define NO_AIR_DETECTED_COUNT                               ( 40 * MS_PER_SECOND )                             ///< No air detected time period count.
+#define PURGE_AIR_TIME_OUT_COUNT                            ( 120 * MS_PER_SECOND )                             ///< Time period count for purge air time out.
 #define PRIME_SALINE_DIALYZER_TIME_OUT_COUNT                ( 60 * MS_PER_SECOND )                             ///< Time period count for prime saline dialyzer time out.
 #define LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME               (  1 * MS_PER_SECOND )                             ///< Time load cell reading steady state detection sampling time in seconds.
 #define PRIME_DIALYSATE_BYPASS_TIME_LIMIT                   ( 15 * MS_PER_SECOND )                             ///< Time limit for priming dialysate bypass circuit.
@@ -102,6 +102,7 @@
 
 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.
@@ -162,6 +163,7 @@
 void transitionToPrime( void )
 {
     primeStartTime = getMSTimerCount();
+    primeFirstPurgePass = TRUE;
 
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RESUME, TRUE );
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RINSEBACK, FALSE );
@@ -427,7 +429,14 @@
 
     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 );
+    }
 }
 
 /*********************************************************************//**
@@ -547,7 +556,12 @@
     {
         purgeAirValvesBloodPumpControl();
         purgeAirTimeOutStartTime = getMSTimerCount();
+        if ( TRUE == primeFirstPurgePass )
+        {
+            primeFirstPurgePass = FALSE;
+        }
         state = HD_PRIME_SALINE_PURGE_AIR_STATE;
+
     }
 
     if ( TRUE == didTimeout( noAirDetectedStartTime, NO_AIR_DETECTED_COUNT ) )
@@ -592,7 +606,7 @@
             setValveAirTrap( STATE_CLOSED );
 
             signalBloodPumpHardStop();
-            setDialInPumpTargetFlowRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+            setDialInPumpTargetFlowRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP, 0.0F );
             setDialOutPumpTargetRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
 
             // Calculate the time out value that must passed prior to checking for the steady state volume in the reservoir
@@ -765,7 +779,7 @@
         if ( TRUE == hasDGCompletedReservoirSwitch() )
         {
             signalBloodPumpHardStop();
-            setDialInPumpTargetFlowRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+            setDialInPumpTargetFlowRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP, 0.0F );
 
             setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
             setValvePosition( VDO, VALVE_POSITION_C_CLOSE );