Index: firmware/App/Modes/ModeDrain.c
===================================================================
diff -u -r978355c6e24dcf66eb7cf87706ede4c97298b535 -r8afa3bb034ae263e20e84ecc2783791776be837a
--- firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 978355c6e24dcf66eb7cf87706ede4c97298b535)
+++ firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 8afa3bb034ae263e20e84ecc2783791776be837a)
@@ -324,8 +324,13 @@
         if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_EMPTY_BOTTLES_ALARM ) != SW_CONFIG_ENABLE_VALUE )
 #endif
         {
+            HD_MODE_SUB_MODE_T hdMode;
+
+            getHDOperationMode( &hdMode );
+
             // Detect empty bottles using integrated volumes
             if ( ( ( acidBottleVolML - getChemicalUsedVolumeML( ACID ) ) <= CONCENTRATE_BOTTLE_ACID_LOW_VOLUME_ML ) && // SRSDG 836
+                 ( hdMode.hdMode != MODE_POST ) &&                            // don't care about concentrates after treatment complete
                  ( getTestConfigStatus( TEST_CONFIG_MIX_WITH_WATER ) != TRUE ) )
             {
                 resetChemicalUsedVolumeML( ACID );
@@ -340,6 +345,7 @@
             }
 
             if ( ( ( bicarbBottleVolML - getChemicalUsedVolumeML( BICARB ) ) <= CONCENTRATE_BOTTLE_BICARB_LOW_VOLUME_ML ) &&  // SRSDG 837
+                 ( hdMode.hdMode != MODE_POST ) &&                            // don't care about concentrates after treatment complete
                  ( getTestConfigStatus( TEST_CONFIG_MIX_WITH_WATER ) != TRUE ) )
             {
                 resetChemicalUsedVolumeML( BICARB );