Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -re5167d0700038c1faf8b689b844a905f20c0d3c6 -r5c3d2c3b1f54008cfdf8fb66ed73f1a8015d9b51
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision e5167d0700038c1faf8b689b844a905f20c0d3c6)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 5c3d2c3b1f54008cfdf8fb66ed73f1a8015d9b51)
@@ -855,6 +855,10 @@
         {
             result = signalUserInitiateChemcialDisinfectFlushMode();
         }
+        else if ( DG_DISINFECT_RO_PERMEATE_SAMPLE_STATE == cmd ) // Command 4 = RO permeate sample
+        {
+            result = signalUserInitiateROPermeateSampleMode();
+        }
     }
 
     sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_UI, result );