Index: firmware/App/Modes/FPModes/FlushConcentrate.c
===================================================================
diff -u -r3094850a313096e5e41497c250089ce1ea9b07d9 -r43161808ceba270f92822369359aa299c647c9fe
--- firmware/App/Modes/FPModes/FlushConcentrate.c	(.../FlushConcentrate.c)	(revision 3094850a313096e5e41497c250089ce1ea9b07d9)
+++ firmware/App/Modes/FPModes/FlushConcentrate.c	(.../FlushConcentrate.c)	(revision 43161808ceba270f92822369359aa299c647c9fe)
@@ -149,12 +149,24 @@
 static FP_CONC_FLUSH_STATE_T handleConcentrateFlushProgressState( void )
 {
     FP_CONC_FLUSH_STATE_T state = CONC_FLUSH_IN_PROGRESS;
+    LEVEL_STATE_T level = getLevelStatus( P25_LEVL );
 
 //    if ( TRUE == 1 ) )// TODO Alarm and Stop State Rework
 //    {
 //        state = CONC_FLUSH_PAUSED;
 //    }
 
+    // Manual control of Permeate tank while in Permeate Flush
+    // to prevent overfill.
+    if ( LEVEL_STATE_HIGH == level )
+    {
+        setValveState( M4_VALV,VALVE_STATE_CLOSED );
+    }
+    else if ( LEVEL_STATE_LOW == level )
+    {
+        setValveState( M4_VALV,VALVE_STATE_OPEN );
+    }
+
     if ( TRUE == didTimeout( concentrateFlushTimer, getConcentrateFlushTimeout() ) )
     {
             isFlushComplete = TRUE;
@@ -235,7 +247,6 @@
             setValveState( P34_VALV, VALVE_STATE_CLOSED );
             setValveState( P37_VALV, VALVE_STATE_OPEN );
             setValveState( P39_VALV, VALVE_STATE_OPEN );
-            startPermeateTankControl();
             if ( TRUE == isBoostPumpInstalled() )
             {
                 setBoostPumpTargetPressure( CONCENTRATE_FLUSH_BOOST_PUMP_TGT_PSI );