Index: firmware/App/Controllers/ROPump.c
===================================================================
diff -u -rc4434389fe6c3314c2bba98dc2f4cf737551f637 -r0831cb6bf766fe461340b711f2ff14c3d797e10d
--- firmware/App/Controllers/ROPump.c	(.../ROPump.c)	(revision c4434389fe6c3314c2bba98dc2f4cf737551f637)
+++ firmware/App/Controllers/ROPump.c	(.../ROPump.c)	(revision 0831cb6bf766fe461340b711f2ff14c3d797e10d)
@@ -48,6 +48,9 @@
 #define ROP_P_COEFFICIENT                   0.005               ///< P term for RO pump control
 #define ROP_I_COEFFICIENT                   0.0025              ///< I term for RO pump control
 
+#define FLOW_SAMPLES_TO_AVERAGE             (250 / TASK_PRIORITY_INTERVAL)              ///< Averaging flow data over 250 ms intervals.
+#define FLOW_AVERAGE_MULTIPLIER             (1.0 / (F32)FLOW_SAMPLES_TO_AVERAGE)        ///< Optimization - multiplying is faster than dividing.
+
 #define ROP_PSI_TO_PWM_DC(p)                ( 0.2 + ( (F32)((p) - 100) * 0.01 ) )  ///< conversion factor from target PSI to PWM duty cycle estimate   TODO - this is a place holder for real conversion
 
 #define RO_FLOW_ADC_TO_LPM_FACTOR           10909.0909          ///< conversion factor from ADC counts to LPM (liters/min) for RO flow rate (multiply this by inverse of FPGA reading).
@@ -88,6 +91,9 @@
 static OVERRIDE_F32_T measuredROFlowRateLPM = { 0.0, 0.0, 0.0, 0 };              ///< measured RO flow rate (in LPM).
 static F32 measuredROPumpPressure = 0.0;                                         ///< measured RO pressure (in PSI).
 
+static S32 measuredFlowReadingsSum = 0;                                          ///< Raw flow reading sums for averaging.
+static U32 flowFilterCounter = 0;                                                ///< used to schedule flow filtering.
+
 static U32 roControlTimerCounter = 0;                                            ///< determines when to perform control on ro pump
 
 static RO_PUMP_SELF_TEST_STATE_T roPumpSelfTestState = RO_PUMP_SELF_TEST_STATE_START;  ///< current ro pump self test state
@@ -183,7 +189,18 @@
 {
     S32 roFlow = (S32)getFPGAROPumpFlowRate();
 
-    measuredROFlowRateLPM.data = ( roFlow == 0 ? 0 : RO_FLOW_ADC_TO_LPM_FACTOR / (F32)(roFlow) );
+    // update sum for flow average calculation
+    measuredFlowReadingsSum += roFlow;
+    // filter every 250ms
+    if ( ++flowFilterCounter >= FLOW_SAMPLES_TO_AVERAGE )
+    {
+        F32 avgROFlow = (F32)measuredFlowReadingsSum * FLOW_AVERAGE_MULTIPLIER;
+
+        measuredROFlowRateLPM.data = ( measuredFlowReadingsSum == 0 ? 0.0 : RO_FLOW_ADC_TO_LPM_FACTOR / avgROFlow );
+        measuredFlowReadingsSum = 0;
+        flowFilterCounter = 0;
+    }
+
     measuredROPumpPressure = getMeasuredDGPressure( PRESSURE_SENSOR_RO_PUMP_OUTLET );
 
     // TODO - check pressure?