Index: firmware/App/Controllers/ConcentratePumps.c
===================================================================
diff -u -ra9315539f527b92523b1598ff91e47db4d71dae2 -rfbecceef31f59ffc46d960803b1123e2ea491c6c
--- firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision a9315539f527b92523b1598ff91e47db4d71dae2)
+++ firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision fbecceef31f59ffc46d960803b1123e2ea491c6c)
@@ -283,7 +283,9 @@
 {
     if ( pumpId < NUM_OF_CONCENTRATE_PUMPS )
     {
+#ifndef DISABLE_CONC_PUMPS
         concentratePumps[ pumpId ].hasTurnOnPumpsBeenRequested = TRUE;
+#endif
     }
     else
     {
@@ -304,8 +306,10 @@
 {
     if ( pumpId < NUM_OF_CONCENTRATE_PUMPS )
     {
+#ifndef DISABLE_CONC_PUMPS
         concentratePumps[ pumpId ].hasTurnOnPumpsBeenRequested = FALSE;
         concentratePumps[ pumpId ].pumpTargetSpeed = 0.0;
+#endif
     }
     else
     {
Index: firmware/App/DGCommon.h
===================================================================
diff -u -rf907c79b56ee0b8e5dad7770ab11a3abaeb821c0 -rfbecceef31f59ffc46d960803b1123e2ea491c6c
--- firmware/App/DGCommon.h	(.../DGCommon.h)	(revision f907c79b56ee0b8e5dad7770ab11a3abaeb821c0)
+++ firmware/App/DGCommon.h	(.../DGCommon.h)	(revision fbecceef31f59ffc46d960803b1123e2ea491c6c)
@@ -56,6 +56,7 @@
 //    #define NEW_FMD_FLOW_SENSOR             1            // Not needed
     #define DISABLE_HEATERS_EFFICIENCY      1
     #define DISABLE_HEAT_DISINFECT_CONDUCTIVITY 1           // Implement
+    #define DISABLE_CONC_PUMPS             1
 
     // Turn these flags on to disable dialysate mixing
     #define DISABLE_DIALYSATE_CHECK         1  // Disabled for Tom  // Implement