Index: sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml
===================================================================
diff -u -reae47411318bcf48addb424f3c2fedcd4d7b92f5 -r40c81d8364424610feeffeb5ac30e990105c8c00
--- sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml	(.../PreTreatmentUltrafiltration.qml)	(revision eae47411318bcf48addb424f3c2fedcd4d7b92f5)
+++ sources/gui/qml/pages/pretreatment/connection/PreTreatmentUltrafiltration.qml	(.../PreTreatmentUltrafiltration.qml)	(revision 40c81d8364424610feeffeb5ac30e990105c8c00)
@@ -41,7 +41,7 @@
 
     function clear() {
         _volumeSlider.reset ( _volumeSlider.defaultValue )
-        _volumeSlider.isActive = false
+        _volumeSlider.isActive = _GuiView.dryDemoMode  //false
     }
 
     function handleMinimum( vValue ) {