Index: firmware/App/Modes/ModeTreatmentParams.c
===================================================================
diff -u -rb156b12139fea40401c94b512503a2ceced69e22 -red4f6eb9692ea0f5f9cb7acae1cf119932fb2d72
--- firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision b156b12139fea40401c94b512503a2ceced69e22)
+++ firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision ed4f6eb9692ea0f5f9cb7acae1cf119932fb2d72)
@@ -433,7 +433,7 @@
         {
             F32 uFRate = uFVolumeMl / (F32)treatmentDuration;
 
-            if ( uFRate > MAX_UF_RATE_ML_MIN )
+            if ( ( uFRate > MAX_UF_RATE_ML_MIN ) || ( uFRate < MIN_UF_RATE_ML_MIN ) )
             {
                 accepted = FALSE;
                 rejReason = REQUEST_REJECT_REASON_UF_RATE_OUT_OF_RANGE;