Index: sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml
===================================================================
diff -u -r124c2e38e72a1a655d9d479c9c7a1cd8c5d5e6c4 -r2e7d498210ba1837f0d77c23c62bf2cf43a26112
--- sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml	(.../PreTreatmentUltrafiltration.qml)	(revision 124c2e38e72a1a655d9d479c9c7a1cd8c5d5e6c4)
+++ sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml	(.../PreTreatmentUltrafiltration.qml)	(revision 2e7d498210ba1837f0d77c23c62bf2cf43a26112)
@@ -29,9 +29,16 @@
 PreTreatmentBase { id: _root
     objectName: "_PreTreatmentUltrafiltration"
 
-    property alias  ufVolume    : _volumeSlider.value
+    property alias  ufVolume : _volumeSlider.value
 
     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()
+    }
 
     function reset( vValue ) {
         if ( ! handleMinimum( vValue ) ) // if not handled go next
@@ -40,8 +47,8 @@
     }
 
     function clear() {
-        _volumeSlider.reset ( _volumeSlider.defaultValue )
-        _volumeSlider.isActive = false
+        _volumeSlider.reset ( _GuiView.dryDemoMode ? 2 : _volumeSlider.defaultValue )
+        _volumeSlider.isActive = _GuiView.dryDemoMode
     }
 
     function handleMinimum( vValue ) {
@@ -95,7 +102,8 @@
             top: parent.top
             topMargin: 425
         }
-        isActive: false
+        // The UF is active by default if the dryDemoMode
+        isActive: _GuiView.dryDemoMode
         width   : Variables.ultrafiltrationProgressbarWidth
         step    : 0.100
         stepSnap: true
@@ -136,5 +144,4 @@
             _volumeSlider.isActive = true
         }
     }
-
 }