Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -rd521a5bf7b77afeaf2b5593f8c287591cda3385c -r68ad3f72e0e99411960c27f50cbec9e2dd797a4a
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision d521a5bf7b77afeaf2b5593f8c287591cda3385c)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 68ad3f72e0e99411960c27f50cbec9e2dd797a4a)
@@ -73,6 +73,7 @@
 
 #define PSI_TO_MMHG                         ( 51.7149F )                                    ///< Conversion factor for converting PSI to mmHg.
 
+// The new arterial pressure sensor is the same as the venous pressure sensor
 #define VENOUS_PRESSURE_NORMAL_OP           0                                               ///< Venous pressure status bits indicate normal operation.
 #define VENOUS_PRESSURE_CMD_MODE            1                                               ///< Venous pressure status bits indicate sensor in command mode.
 #define VENOUS_PRESSURE_STALE_DATA          2                                               ///< Venous pressure status bits indicate data is stale (no new data since last fpga read).
@@ -661,7 +662,6 @@
                 }
             }
         }
-
         // Check for occlusion in Treatment modes where pumps are moving
         else if ( MODE_TREA == getCurrentOperationMode() )
         {
Index: firmware/App/Modes/ModePreTreat.c
===================================================================
diff -u -rd521a5bf7b77afeaf2b5593f8c287591cda3385c -r68ad3f72e0e99411960c27f50cbec9e2dd797a4a
--- firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision d521a5bf7b77afeaf2b5593f8c287591cda3385c)
+++ firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision 68ad3f72e0e99411960c27f50cbec9e2dd797a4a)
@@ -48,11 +48,11 @@
 #define PRE_TREATMENT_FLUSH_FILL_TARGET_TEMP_C        45.0F             ///< Pre treatment flush fill target temperature in C.
 #define PRE_TREATMENT_NORMAL_FILL_TARGET_TEMP_C       ( 37.0F + 2.0F )  ///< Pre treatment normal fill target temperature in C.
 
-#define PRE_TREATMENT_MIN_FILL_RESERVOIR_VOLUME_ML      500             ///< Fill reservoir to this volume minimum to prep volume during development.
-#define PRE_TREATMENT_FLUSH_RESERVOIR_VOLUME_ML         500             ///< Fill reservoir to this volume (in mL) to flush filter and lines.
-#define PRE_TREATMENT_FILL_RESERVOIR_ONE_VOLUME_ML      1300            ///< Fill reservoir one to this volume (in mL) during pre-treatment mode.
-#define PRE_TREATMENT_FILL_RESERVOIR_TWO_VOLUME_ML      600             ///< Fill reservoir two to this volume (in mL) during pre-treatment mode.
-#define PRE_TREATMENT_FULL_RESERVOIR_VOLUME_ML          1500            ///< Fill reservoir to this volume minimum to prep volume during development.
+#define PRE_TREATMENT_MIN_FILL_RESERVOIR_VOLUME_ML    500               ///< Fill reservoir to this volume minimum to prep volume during development.
+#define PRE_TREATMENT_FLUSH_RESERVOIR_VOLUME_ML       500               ///< Fill reservoir to this volume (in mL) to flush filter and lines.
+#define PRE_TREATMENT_FILL_RESERVOIR_ONE_VOLUME_ML    1300              ///< Fill reservoir one to this volume (in mL) during pre-treatment mode.
+#define PRE_TREATMENT_FILL_RESERVOIR_TWO_VOLUME_ML    750               ///< Fill reservoir two to this volume (in mL) during pre-treatment mode.
+#define PRE_TREATMENT_FULL_RESERVOIR_VOLUME_ML        1500              ///< Fill reservoir to this volume minimum to prep volume during development.
 
 #define PRE_TREATMENT_FLUSH_COUNT                     2                 ///< Number of flush cycles for each reservoir.