Index: firmware/App/Controllers/DialOutFlow.c
===================================================================
diff -u -rf124efbd92b66cb23ac24dccbdbef48e52cab7c5 -rb5756e5b5041288a2e95585990cce5a93756d693
--- firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision f124efbd92b66cb23ac24dccbdbef48e52cab7c5)
+++ firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision b5756e5b5041288a2e95585990cce5a93756d693)
@@ -45,7 +45,8 @@
 #define MIN_DIAL_OUT_FLOW_RATE                  100             ///< Minimum dialysate outlet pump flow rate in mL/min.
 #define DPO_FLOW_ADJ_DUE_TO_HIGHER_INLET_PRES   0.875           ///< Adjustment factor to account for higher pump inlet pressure (than DPi pump inlet).
 
-#define MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE       0.01            ///< Maximum duty cycle change when ramping.
+#define MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE    0.0133          ///< Maximum duty cycle change when ramping up ~ 200 mL/min/s.
+#define MAX_DIAL_OUT_PUMP_PWM_STEP_DN_CHANGE    0.02            ///< Maximum duty cycle change when ramping down ~ 300 mL/min/s.
 #define MAX_DIAL_OUT_PUMP_PWM_DUTY_CYCLE        0.88            ///< Controller will error if PWM duty cycle > 90%, so set max to 88%.
 #define MIN_DIAL_OUT_PUMP_PWM_DUTY_CYCLE        0.12            ///< Controller will error if PWM duty cycle < 10%, so set min to 12%.
 
@@ -488,7 +489,7 @@
     if ( lastGivenRate > 0 )
     {
         // set initial PWM duty cycle
-        dialOutPumpPWMDutyCyclePctSet = DOP_PWM_ZERO_OFFSET + MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE;
+        dialOutPumpPWMDutyCyclePctSet = DOP_PWM_ZERO_OFFSET + MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE;
         setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
         // allow dialOut pump to run in requested direction
         setDialOutPumpDirection( dialOutPumpDirection );
@@ -521,7 +522,7 @@
     if ( dialOutPumpPWMDutyCyclePct < NEARLY_ZERO )
     {
         // start ramp down to stop
-        dialOutPumpPWMDutyCyclePctSet -= MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE;
+        dialOutPumpPWMDutyCyclePctSet -= MAX_DIAL_OUT_PUMP_PWM_STEP_DN_CHANGE;
         setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
         result = DIAL_OUT_PUMP_RAMPING_DOWN_STATE;
     }
@@ -541,7 +542,7 @@
     // continue ramp up
     else
     {
-        dialOutPumpPWMDutyCyclePctSet += MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE;
+        dialOutPumpPWMDutyCyclePctSet += MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE;
         setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
     }
 
@@ -562,7 +563,7 @@
     DIAL_OUT_PUMP_STATE_T result = DIAL_OUT_PUMP_RAMPING_DOWN_STATE;
 
     // have we essentially reached zero speed
-    if ( dialOutPumpPWMDutyCyclePctSet < (MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE + DOP_PWM_ZERO_OFFSET) )
+    if ( dialOutPumpPWMDutyCyclePctSet < (MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE + DOP_PWM_ZERO_OFFSET) )
     {
         stopDialOutPump();
         result = DIAL_OUT_PUMP_OFF_STATE;
@@ -583,7 +584,7 @@
     // continue ramp down
     else
     {
-        dialOutPumpPWMDutyCyclePctSet -= MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE;
+        dialOutPumpPWMDutyCyclePctSet -= MAX_DIAL_OUT_PUMP_PWM_STEP_DN_CHANGE;
         setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
     }
 
@@ -617,9 +618,9 @@
             newPWM = runPIController( PI_CONTROLLER_ID_ULTRAFILTRATION, refVol, totVol );
             // limit PWM change to max
             deltaPWM = newPWM - dialOutPumpPWMDutyCyclePctSet;
-            if ( FABS( deltaPWM ) > MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE )
+            if ( FABS( deltaPWM ) > MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE )
             {
-                newPWM = ( deltaPWM < 0.0 ? dialOutPumpPWMDutyCyclePctSet - MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE : dialOutPumpPWMDutyCyclePctSet + MAX_DIAL_OUT_PUMP_PWM_STEP_CHANGE );
+                newPWM = ( deltaPWM < 0.0 ? dialOutPumpPWMDutyCyclePctSet - MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE : dialOutPumpPWMDutyCyclePctSet + MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE );
             }
             // set new PWM
             dialOutPumpPWMDutyCyclePctSet = newPWM;