Index: firmware/App/Controllers/DialOutFlow.c
===================================================================
diff -u -r1ebbe403d260d9f65695c13d6dbafbe1a93cfdde -r8691c0722f9fa690de0b789a2c020b1ad8e86def
--- firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision 1ebbe403d260d9f65695c13d6dbafbe1a93cfdde)
+++ firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision 8691c0722f9fa690de0b789a2c020b1ad8e86def)
@@ -85,7 +85,6 @@
 
 #define DOP_SPEED_ADC_TO_RPM_FACTOR             1.751752        ///< Conversion factor from ADC counts to RPM for dialysate outlet pump motor.
 #define DOP_MOTOR_RPM_TO_PWM_DC_FACTOR          0.000193        ///< ~52 BP motor RPM = 1% PWM duty cycle
-#define UF_PWM_DC_PCT_PER_ML_PER_MIN            0.004           ///< Estimated DPo PWM duty cycle amount per each mL/min of ultrafiltration desired.
 #define DOP_CURRENT_ADC_TO_MA_FACTOR            3.002           ///< Conversion factor from ADC counts to mA for dialysate outlet pump motor.
 #define DOP_ADC_FULL_SCALE_V                    3.0             ///< DPo analog signals are 0-3V (while int. ADC ref V may be different).
 #define DOP_ADC_ZERO                            1998            ///< Mid-point (zero) for ADC readings.
@@ -515,7 +514,7 @@
         }
         else
         {   // Closed loop UF control is only controlling offset from DPi PWM
-            resetPIController( PI_CONTROLLER_ID_ULTRAFILTRATION, (F32)( (S32)lastGivenRate - getTargetDialInFlowRate() ) * UF_PWM_DC_PCT_PER_ML_PER_MIN );
+            resetPIController( PI_CONTROLLER_ID_ULTRAFILTRATION, dialOutPumpPWMDutyCyclePctSet - getDialInPumpPWMDutyCyclePct() );
         }
         dialOutPumpControlModeSet = dialOutPumpControlMode;
         setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
@@ -560,7 +559,7 @@
         }
         else
         {   // Closed loop UF control is only controlling offset from DPi PWM
-            resetPIController( PI_CONTROLLER_ID_ULTRAFILTRATION, (F32)( (S32)lastGivenRate - getTargetDialInFlowRate() ) * UF_PWM_DC_PCT_PER_ML_PER_MIN );
+            resetPIController( PI_CONTROLLER_ID_ULTRAFILTRATION, dialOutPumpPWMDutyCyclePctSet - getDialInPumpPWMDutyCyclePct() );
         }
         dialOutPumpControlModeSet = dialOutPumpControlMode;
         setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );