Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -r1efa1af5337b36f5022df5ce8cb7459352f13a8b -r1e1576d7b9653037829d1d4f834c1077a63fe3fe
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 1efa1af5337b36f5022df5ce8cb7459352f13a8b)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 1e1576d7b9653037829d1d4f834c1077a63fe3fe)
@@ -107,8 +107,7 @@
 #define DIP_PWM_ZERO_OFFSET                  0.1F            ///< 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)*(rate)) * 0.000001 ) + ( (rate) * 0.0005 ) + 0.126 + DIP_PWM_ZERO_OFFSET )
-//#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 )
+#define DIP_PWM_FROM_ML_PER_MIN(rate)        ( ( ( (rate) - 49.121F ) / 684.73F ) + DIP_PWM_ZERO_OFFSET )
 /// Conversion from PWM duty cycle % to commanded pump motor speed.  PWM range is 10% to 90%.  RPM range is 0 to 3200.  3200 / 0.8 = 4000.
 #define DIP_PWM_TO_MOTOR_SPEED_RPM(pwm)      ( ((pwm) - DIP_PWM_ZERO_OFFSET) * 4000.0F )