Index: firmware/App/Controllers/SpentChamberFill.c
===================================================================
diff -u -r0a74bcce6674271e35d5154003dd6c25011f80f9 -re6415d33321e7990c3b5e82b0c8a87c64cc3a2c8
--- firmware/App/Controllers/SpentChamberFill.c	(.../SpentChamberFill.c)	(revision 0a74bcce6674271e35d5154003dd6c25011f80f9)
+++ firmware/App/Controllers/SpentChamberFill.c	(.../SpentChamberFill.c)	(revision e6415d33321e7990c3b5e82b0c8a87c64cc3a2c8)
@@ -230,6 +230,8 @@
         // start acid and bicarb pump with the expected quantity
         setConcentratePumpTargetSpeed( D11_PUMP, CONCENTRATE_PUMP_MAX_SPEED, acidDoseVolume );
         setConcentratePumpTargetSpeed( D10_PUMP, CONCENTRATE_PUMP_MAX_SPEED, bicarbDoseVolume );
+        requestConcentratePumpOn( D11_PUMP );
+        requestConcentratePumpOn( D10_PUMP );
 
         state = SPENT_CHAMBER_FILL_STATE1_DOSING_CNTRL;
     }
@@ -317,6 +319,8 @@
         // start acid and bicarb pump with the expected quantity
         setConcentratePumpTargetSpeed( D11_PUMP, CONCENTRATE_PUMP_MAX_SPEED, acidDoseVolume );
         setConcentratePumpTargetSpeed( D10_PUMP, CONCENTRATE_PUMP_MAX_SPEED, bicarbDoseVolume );
+        requestConcentratePumpOn( D11_PUMP );
+        requestConcentratePumpOn( D10_PUMP );
 
         state = SPENT_CHAMBER_FILL_STATE2_DOSING_CNTRL;
     }