Index: firmware/App/Controllers/DialysatePumps.c
===================================================================
diff -u -r724b64673b719eaac10b0c9dd839ad9675274911 -rf6022e86136c821709ce24b61e11e8e2bdf0b11e
--- firmware/App/Controllers/DialysatePumps.c	(.../DialysatePumps.c)	(revision 724b64673b719eaac10b0c9dd839ad9675274911)
+++ firmware/App/Controllers/DialysatePumps.c	(.../DialysatePumps.c)	(revision f6022e86136c821709ce24b61e11e8e2bdf0b11e)
@@ -60,10 +60,8 @@
 #define MAX_FPGA_DIALYSATE_PUMP_DIRECTION_FAULT_WINDOW_MS   ( 1 * SEC_PER_MIN * MS_PER_SECOND )                     ///< FPGA dialysate pump direction fault window
 #define MAX_FPGA_DIALYSATE_PUMP_DIRECTION_FAULT_FAILURES    10                                                      ///< FPGA dialysate pump direction fault failures per MAX_FPGA_DIALYSATE_PUMP_DIRECTION_FAULT_WINDOW_MS
 
-#define FRESH_DIALYSATE_TARGET_PRESSURE_PSI                 25.0F                                                   ///< Fresh dialysate pump recommended pressure(D18) in psi.
-#define FRESH_DIALYSATE_MAX_PRESSURE_PSI                    26.0F                                                   ///< Fresh dialysate pump maximum allowed (D18) pressure in psi.
-#define SPENT_DIALYSATE_TARGET_PRESSURE_PSI                 29.0F                                                   ///< Spent dialysate pump recommended pressure(PDs) in psi.
-#define SPENT_DIALYSATE_MAX_PRESSURE_PSI                    30.0F                                                   ///< Spent dialysate pump maximum allowed (PDs) pressure in psi.
+#define DEFAULT_FRESH_DIALYSATE_TARGET_PRESSURE_PSI         -12.79F                                                 ///< Default degas pump(D18) target pressure (at zero sea level)in psi.
+#define DEFAULT_SPENT_DIALYSATE_TARGET_PRESSURE_PSI         30.0F                                                   ///< Default spent dialysate pump target pressure(D48) in psi.
 #define FRESH_DIAL_OPEN_LOOP_SPEED_RPM                      2000.0F                                                 ///< fresh dialysate pump open loop speed to meet target pressure.
 #define SPENT_DIAL_OPEN_LOOP_SPEED_RPM                      2500.0F                                                 ///< spent dialysate pump open loop speed to meet target pressure.
 #define DIALYSATE_PUMP_SPEED_ZERO_RPM                       0                                                       ///< Dialysate pump zero RPM speed.
@@ -75,6 +73,8 @@
 #define D48_PUMP_P_COEFFICIENT                              20.0F                                                   ///< P term for spent dialysate pump delta pressure control.
 #define D48_PUMP_I_COEFFICIENT                              60.0F                                                   ///< I term for spent dialysate pump delta pressure control.
 #define DIAL_PUMP_NO_FEED_FORWARD                           0.0F                                                    ///< Feedforward term for dialysate pump control
+#define DEGAS_PUMP_SLOPE_FACTOR                            -0.0156F                                                 ///< Dialysate pump target pressure multiply factor ( m factor in 'y = mx + b' equation)
+#define DEGAS_PUMP_INTERCEPT_FACTOR                         0.1153F                                                 ///< Dialysate pump target pressure addition factor ( b factor in 'y = mx + b' equation)
 
 #define MAX_ALLOWED_RPM_OUT_OF_RANGE                        300                                                     ///< Maximum allowed RPM out of range from target RPM in open loop.
 #define PUMP_TRANS_TO_RAMP_SPEED_THRESHOLD                  20.0F                                                   ///< Speed change that alters the state to ramp during control state.
@@ -153,6 +153,7 @@
 static DIALYSATE_PUMP_STATE_T handleDialysatePumpRampToTargetState( DIALYSATE_PUMPS_T pumpId );
 static DIALYSATE_PUMP_STATE_T handleDialysatePumpOffState( DIALYSATE_PUMPS_T pumpId );
 static void monitorPumpDirectionErrorCount( DIALYSATE_PUMPS_T pumpId );
+static void calculateDegasPumpTargetPressure( void );
 
 /*********************************************************************//**
  * @brief
@@ -202,13 +203,13 @@
        signalDialysatePumpHardStop( pumpId );
     }
 
-    pumpTargetPressure[D12_PUMP].data             = FRESH_DIALYSATE_TARGET_PRESSURE_PSI;
-    pumpTargetPressure[D12_PUMP].ovInitData       = FRESH_DIALYSATE_TARGET_PRESSURE_PSI;
+    pumpTargetPressure[D12_PUMP].data             = DEFAULT_FRESH_DIALYSATE_TARGET_PRESSURE_PSI;
+    pumpTargetPressure[D12_PUMP].ovInitData       = DEFAULT_FRESH_DIALYSATE_TARGET_PRESSURE_PSI;
     pumpTargetPressure[D12_PUMP].ovData           = 0.0F;
     pumpTargetPressure[D12_PUMP].override         = OVERRIDE_RESET;
 
-    pumpTargetPressure[D48_PUMP].data             = SPENT_DIALYSATE_TARGET_PRESSURE_PSI;
-    pumpTargetPressure[D48_PUMP].ovInitData       = SPENT_DIALYSATE_TARGET_PRESSURE_PSI;
+    pumpTargetPressure[D48_PUMP].data             = DEFAULT_SPENT_DIALYSATE_TARGET_PRESSURE_PSI;
+    pumpTargetPressure[D48_PUMP].ovInitData       = DEFAULT_SPENT_DIALYSATE_TARGET_PRESSURE_PSI;
     pumpTargetPressure[D48_PUMP].ovData           = 0.0F;
     pumpTargetPressure[D48_PUMP].override         = OVERRIDE_RESET;
 
@@ -251,6 +252,23 @@
 
 /*********************************************************************//**
  * @brief
+ * The calculateDegasPumpTargetPressure function gets the barometric pressure
+ * sensor reading to calcualte degassing pump(D12) target control pressure for closed
+ * loop control.
+ * @details \b Inputs: none
+ * @details \b Outputs: pumpTargetSpeed.
+ * @return none
+ *************************************************************************/
+static void calculateDegasPumpTargetPressure( void )
+{
+    F32 pressureInmmHg = getFilteredPressure( BARO_PRES );
+
+    //Get the degassing target pressure
+    pumpTargetPressure[D12_PUMP].data = ( ( DEGAS_PUMP_SLOPE_FACTOR * pressureInmmHg ) + DEGAS_PUMP_INTERCEPT_FACTOR ) + DEGAS_PUMP_TARGET_PRES_ADJ_THRESHOLD;
+}
+
+/*********************************************************************//**
+ * @brief
  * The setDialysatePumpTargetSpeed function sets a new target RPM for the
  * dialysate pump.
  * @details \b Inputs: none
@@ -281,9 +299,13 @@
             pumpTargetSpeed[ pumpId ].data = MAX_DIALYSATE_PUMP_RPM;
         }
 
-        // Open loop or close loop control
+        // Assign Open loop or close loop control
         isDialPumpOpenLoopEnabled[ pumpId ] = isOpenLoopControlEnabled;
 
+#ifdef __BARO_PRES_SENSOR__
+        //Update Degas pump target speed
+        calculateDegasPumpTargetPressure();
+#endif
         //handle target speed update when pump is running
         if ( DIALYSATE_PUMP_CONTROL_TO_TARGET_STATE == dialysatePumps[ pumpId ].dialysatePumpState )
         {