Index: firmware/App/Modes/ModePreTreat.c
===================================================================
diff -u -r526e890e4e35fac0a622af538bf611ea15a30609 -r9b6d9a0db373b39c3d04dd07516fde59b292bbc5
--- firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision 526e890e4e35fac0a622af538bf611ea15a30609)
+++ firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision 9b6d9a0db373b39c3d04dd07516fde59b292bbc5)
@@ -1527,6 +1527,9 @@
 
                 // Set the heating parameters
                 setPreTreatmentHeatingParams( targetTempC, FILL_RESERVOIR_TO_VOLUME_ML, DEFAULT_TARGET_FILL_FLOW_RATE_LPM, dialysateFlowMLPM );
+                // after reservoir fill at end of the pre-treatment, do park the concentrate pumps to maintain conductivity
+                // when treatment begins
+                cmdDGParkConcentratePumps();
                 state = PRE_TREATMENT_RESERVOIR_MGMT_COMPLETE_STATE;
             }
             else