Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r7de21ac8b699cafdfeaefbf2c062c3e21bcc956d -re408267b7e73d664051a46e65ac248749af8e5be
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 7de21ac8b699cafdfeaefbf2c062c3e21bcc956d)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision e408267b7e73d664051a46e65ac248749af8e5be)
@@ -7,8 +7,8 @@
 *
 * @file    Prime.c
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      21-Oct-2022
+* @author  (last)      Dara Navaei
+* @date    (last)      07-Nov-2022
 *
 * @author  (original)  Quang Nguyen
 * @date    (original)  08-Dec-2020
@@ -60,6 +60,8 @@
 #define STEADY_VOLUME_COUNT_SEC                             ( 10000 / LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME )  ///< Counter must be greater than 10 seconds before steady volume is true.
 #define STEADY_VOLUME_TIME_DEADLINE_MS                      ( 55 * MS_PER_SECOND )                             ///< Time in msec for the steady volume deadline time out.
 
+#define VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG               ( 200.0F )                                         ///< Maximum arterial pressure reading (in mmHg) for bubble clear.
+
 /// States of the treatment reservoir management state machine.
 typedef enum PrimeReservoirMgmt_States
 {
@@ -109,6 +111,7 @@
 static U32 noAirDetectedStartTime;                              ///< starting time when detecting no air.
 static U32 purgeAirTimeOutStartTime;                            ///< Starting time for purge air state time out.
 static U32 primeSalineDialyzerStartTime;                        ///< Starting time of priming saline dialyzer circuit.
+static U32 primeSalineDialyzerBubbleClearStartTime;             ///< Starting time of priming saline dialyzer bubble clear.
 static U32 primeDialysateDialyzerStartTime;                     ///< Starting time of priming dialysate dialyzer circuit.
 static U32 primeDialysateBypassStartTime;                       ///< Starting time of priming dialysate bypass circuit.
 static U32 steadyVolumeSamplingStartTime;                       ///< Load cell steady volume sampling interval starting time.
@@ -594,8 +597,6 @@
         rsrvrCmd.reservoirID            = (U32)DG_RESERVOIR_1;
         rsrvrCmd.useLastTrimmerHeaterDC = FALSE;
 
-        cmdSetDGActiveReservoir( &rsrvrCmd );
-
         if ( TRUE == hasDGCompletedReservoirSwitch() )
         {
             U32 dialyzerDialysateVolume = getDialyzerDialysateVolume();
@@ -608,7 +609,7 @@
 
             signalBloodPumpHardStop();
             setDialInPumpTargetFlowRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
-            setDialOutPumpTargetRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+            setDialOutPumpTargetRate( 225, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP ); // 225 target flow rate matches PWM duty cycle for DPi pump @ 300.
 
             // Calculate the time out value that must passed prior to checking for the steady state volume in the reservoir
             primeDialysateDialyzerTimeLimit = (U32)( ( ( DIALYSATE_DIALYZER_TUBE_VOLUME_ML + dialyzerDialysateVolume ) * SEC_PER_MIN * MS_PER_SECOND ) / DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN );
@@ -720,6 +721,7 @@
 
     primeSalineDialyzerTimeLimit = (U32)( ( ( dialyzerDialysateVolume * DIALYZER_VOLUME_SCALE_FACTOR + DIALYZER_DVI_PATH_VOLUME_ML ) * SEC_PER_MIN * MS_PER_SECOND ) / BLOOD_PUMP_FLOW_RATE_SALINE_DIALYZER_ML_MIN );
     primeSalineDialyzerStartTime = getMSTimerCount();
+    primeSalineDialyzerBubbleClearStartTime = getMSTimerCount();
 
     if ( TRUE == doesAlarmStatusIndicateStop() )
     {
@@ -740,8 +742,24 @@
  *************************************************************************/
 static HD_PRE_TREATMENT_PRIME_STATE_T handlePrimeSalineDialyzerState( void )
 {
+    static BOOL bubbleClearActive = FALSE;
+
     HD_PRE_TREATMENT_PRIME_STATE_T state = HD_PRIME_SALINE_DIALYZER_STATE;
 
+    // Close valve 4-5 times to create pressure to clear Dialyzer bubbles
+    if ( TRUE == didTimeout( primeSalineDialyzerBubbleClearStartTime, ( primeSalineDialyzerTimeLimit / 5 ) ) )
+    {
+        primeSalineDialyzerBubbleClearStartTime = getMSTimerCount();
+        setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
+        bubbleClearActive = TRUE;
+    }
+    // TODO - could also check for valve closed too long here (maybe > 2sec) in case not opening based on pressure
+    if ( ( TRUE == bubbleClearActive ) && ( getMeasuredVenousPressure() > VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG ) )
+    {
+        // Pressure max reached, release pressure
+        setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );
+        bubbleClearActive = FALSE;
+    }
     if ( TRUE == didTimeout( primeSalineDialyzerStartTime, primeSalineDialyzerTimeLimit ) )
     {
         state = HD_PRIME_RESERVOIR_TWO_FILL_COMPLETE_STATE;