Index: firmware/App/Modes/FlushPermeate.c
===================================================================
diff -u -r74be2e300c7b0ad2a069cea4b1dc2cff06ec0d3e -rb6b45de61b9f011263147c7313134198fa83725f
--- firmware/App/Modes/FlushPermeate.c	(.../FlushPermeate.c)	(revision 74be2e300c7b0ad2a069cea4b1dc2cff06ec0d3e)
+++ firmware/App/Modes/FlushPermeate.c	(.../FlushPermeate.c)	(revision b6b45de61b9f011263147c7313134198fa83725f)
@@ -19,6 +19,7 @@
 #include "Conductivity.h"
 #include "FlushPermeate.h"
 #include "FPOperationModes.h"
+#include "Level.h"
 #include "MessageSupport.h"
 #include "Messaging.h"
 #include "Pressure.h"
@@ -140,12 +141,24 @@
 static FP_PERM_FLUSH_STATE_T handlePermeateFlushProgressState( void )
 {
     FP_PERM_FLUSH_STATE_T state = PERM_FLUSH_IN_PROGRESS;
+    LEVEL_STATE_T level = getLevelStatus();
 
 //    if ( TRUE == 1 ))// TODO Alarm and Stop State Rework
 //    {
 //        state = PERM_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( permeateFlushTimer, getPermeateFlushTimeout() ) )
     {
         F32 p18conductivity = getFilteredConductivity( P18_COND );