Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -rfc923bac57545b5794893c47a97770d8d7cfcee4 -r631e89a8c43a1c411efef353a037eda8bbdb06ef
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision fc923bac57545b5794893c47a97770d8d7cfcee4)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision 631e89a8c43a1c411efef353a037eda8bbdb06ef)
@@ -1184,6 +1184,7 @@
         }
         // UF volume cannot be set lower than the UF volume that has already been collected
         else if ( ( uFVolume > ( getF32TreatmentParamUpperRangeLimit( TREATMENT_PARAM_UF_VOLUME ) * ML_PER_LITER ) ) ||
+                  ( uFVolume < ( getF32TreatmentParamLowerRangeLimit( TREATMENT_PARAM_UF_VOLUME ) * ML_PER_LITER ) ) ||
                   ( uFVolume <= colUFVol ) )
         {
             rejectReason = REQUEST_REJECT_REASON_UF_VOLUME_OUT_OF_RANGE;