Index: sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml
===================================================================
diff -u -rf6111d1b41ad5103eb561c0159c17d694642b693 -rbd12a330df798024c3de30f727058d971dfc2cbe
--- sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml	(.../PreTreatmentUltrafiltration.qml)	(revision f6111d1b41ad5103eb561c0159c17d694642b693)
+++ sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml	(.../PreTreatmentUltrafiltration.qml)	(revision bd12a330df798024c3de30f727058d971dfc2cbe)
@@ -33,6 +33,10 @@
 
     header.confirmEnabled: _volumeSlider.isActive
     onVisibleChanged: {
+        /*
+        It is only for the dry-demo due to its independent flow.
+        Otherwise, won't needed in the normal designed user-flow.
+        */
         clear()
     }