Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -r5070f8552a200e15dcc2ca0532db10fba9dc8c6b -rdfece12385652318f19c2aa3bd0a5992b0396bec
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 5070f8552a200e15dcc2ca0532db10fba9dc8c6b)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision dfece12385652318f19c2aa3bd0a5992b0396bec)
@@ -98,8 +98,8 @@
 #define DIP_ML_PER_MIN_TO_PUMP_RPM_FACTOR    ( DIP_REV_PER_LITER / ML_PER_LITER )
 #define DIP_GEAR_RATIO                       32.0            ///< DialIn pump motor to dialIn pump gear ratio.
 #define DIP_PWM_ZERO_OFFSET                  0.1             ///< 10% PWM duty cycle = zero speed.
-/// Macro converts flow rate to estimate PWM needed to achieve it.
-#define DIP_PWM_FROM_ML_PER_MIN(rate)        ( (rate) * DIP_ML_PER_MIN_TO_PUMP_RPM_FACTOR * DIP_GEAR_RATIO * DIP_MOTOR_RPM_TO_PWM_DC_FACTOR + DIP_PWM_ZERO_OFFSET )
+/// Macro converts flow rate to estimate PWM needed to achieve it.   // TODO - I added 1.2 gain based on empirical data
+#define DIP_PWM_FROM_ML_PER_MIN(rate)        ( (rate) * DIP_ML_PER_MIN_TO_PUMP_RPM_FACTOR * DIP_GEAR_RATIO * DIP_MOTOR_RPM_TO_PWM_DC_FACTOR * 1.2 + DIP_PWM_ZERO_OFFSET )
 /// Conversion from PWM duty cycle % to commanded pump motor speed.
 #define DIP_PWM_TO_MOTOR_SPEED_RPM(pwm)      ( ((pwm) - DIP_PWM_ZERO_OFFSET) * 4000.0 )
 
Index: firmware/App/HDCommon.h
===================================================================
diff -u -ra25c11a9beb66c7292a184e3bc02a1a5ded5ed8a -rdfece12385652318f19c2aa3bd0a5992b0396bec
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision a25c11a9beb66c7292a184e3bc02a1a5ded5ed8a)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision dfece12385652318f19c2aa3bd0a5992b0396bec)
@@ -49,6 +49,7 @@
     #define USE_FMD_FLOW_SENSOR             1           // Use FMD flow sensor (on HD) instead of FMD on DG
     #define USE_FMB_FLOW_SENSOR             1           // Use FMB flow sensor instead of flow estimation from pump speed/pressure/wearing
     #define RUN_BP_OPEN_LOOP                1           // Run blood pump in open loop mode
+    #define RUN_DPI_OPEN_LOOP               1           // Run dialysate inlet pump in open loop mode
     #define DISABLE_MOTOR_CURRENT_CHECKS    1           // Do not error on HD pump current checks
     #define DISABLE_PUMP_FLOW_CHECKS        1           // Do not error on HD pump flow checks
     #define DISABLE_PUMP_SPEED_CHECKS       1           // Do not error on HD pump speed checks
Index: firmware/App/Modes/Dialysis.c
===================================================================
diff -u -r0237b2fc49d60b6602bac35ce43831b37f294c81 -rdfece12385652318f19c2aa3bd0a5992b0396bec
--- firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision 0237b2fc49d60b6602bac35ce43831b37f294c81)
+++ firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision dfece12385652318f19c2aa3bd0a5992b0396bec)
@@ -207,8 +207,12 @@
 #else
     setBloodPumpTargetFlowRate( setBloodFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
 #endif
+#ifndef RUN_DPI_OPEN_LOOP
     setDialInPumpTargetFlowRate( setDialysateFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_CLOSED_LOOP );
 #else
+    setDialInPumpTargetFlowRate( setDialysateFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+#endif
+#else
     setBloodPumpTargetFlowRate( setBloodFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
     setDialInPumpTargetFlowRate( setDialysateFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
 #endif
@@ -298,8 +302,12 @@
 #else
         setBloodPumpTargetFlowRate( setBloodFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
 #endif
+#ifndef RUN_DPI_OPEN_LOOP
         setDialInPumpTargetFlowRate( setDialysateFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_CLOSED_LOOP );
 #else
+        setDialInPumpTargetFlowRate( setDialysateFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+#endif
+#else
         setBloodPumpTargetFlowRate( setBloodFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
         setDialInPumpTargetFlowRate( setDialysateFlowRate, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
 #endif