Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -rf8278ffe0845a6e5ed80018bcebbcfec0eba23d2 -rb1aab6732e8b04cc00b0ca7876901b38d2a8cb71
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision f8278ffe0845a6e5ed80018bcebbcfec0eba23d2)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision b1aab6732e8b04cc00b0ca7876901b38d2a8cb71)
@@ -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;