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
     {