Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -rbb63d313f1edeb2fa72f992cedab03b13cdf644a -raf2cd84d3319b1e298057fe2d329aa7824306507
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision bb63d313f1edeb2fa72f992cedab03b13cdf644a)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision af2cd84d3319b1e298057fe2d329aa7824306507)
@@ -112,7 +112,7 @@
 /// Conversion from PWM duty cycle % to commanded pump motor speed.
 #define DIP_PWM_TO_MOTOR_SPEED_RPM(pwm)      ( ((pwm) - DIP_PWM_ZERO_OFFSET) * 4000.0F )
 // Macro converts PWM to estimate flow rate needed to achieve it.
-#define DIP_ML_PER_MIN_FROM_PWM(pwm)         ( (( pwm + DIP_PWM_ZERO_OFFSET) * 684.73 ) + 49.121 )
+#define DIP_ML_PER_MIN_FROM_PWM(pwm)         ( (( pwm - DIP_PWM_ZERO_OFFSET) * 684.73 ) + 49.121 )
 
 
 /// Measured dialIn flow is filtered w/ moving average.
@@ -1630,7 +1630,6 @@
     return result;
 }
 
-
 /*********************************************************************//**
  * @brief
  * The testSetDialInPumpTargetDutyCycle function resets the override of the
@@ -1652,6 +1651,5 @@
     return result;
 }
 
-
 
 /**@}*/