Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r6e8917e48113a8798b26e489296a3f69509c0590 -r47a7da55aea88cd7a2b06870226122d0cc8be540
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 6e8917e48113a8798b26e489296a3f69509c0590)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 47a7da55aea88cd7a2b06870226122d0cc8be540)
@@ -340,7 +340,6 @@
 BOOL sendChangeUFSettingsResponse( BOOL accepted, U32 reason, F32 volume_mL, U32 time_min, F32 ufRate_mL_min, S32 timeDiff, F32 rateDiff, F32 oldUFRate_mL_min )
 {
     BOOL result;
-    F32 volume_L = volume_mL / (F32)ML_PER_LITER;
     MESSAGE_T msg;
     U08 *payloadPtr = msg.payload;
 
@@ -353,7 +352,7 @@
     payloadPtr += sizeof( BOOL );
     memcpy( payloadPtr, &reason, sizeof( U32) );
     payloadPtr += sizeof( U32 );
-    memcpy( payloadPtr, &volume_L, sizeof( F32 ) );
+    memcpy( payloadPtr, &volume_mL, sizeof( F32 ) );
     payloadPtr += sizeof( F32 );
     memcpy( payloadPtr, &time_min, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
@@ -389,7 +388,6 @@
 BOOL sendChangeUFSettingsOptionResponse( BOOL accepted, U32 reason, F32 volume_mL, U32 time_min, F32 ufRate_mL_min )
 {
     BOOL result;
-    F32 volume_L = volume_mL / (F32)ML_PER_LITER;
     MESSAGE_T msg;
     U08 *payloadPtr = msg.payload;
 
@@ -402,7 +400,7 @@
     payloadPtr += sizeof( BOOL );
     memcpy( payloadPtr, &reason, sizeof( U32) );
     payloadPtr += sizeof( U32 );
-    memcpy( payloadPtr, &volume_L, sizeof( F32 ) );
+    memcpy( payloadPtr, &volume_mL, sizeof( F32 ) );
     payloadPtr += sizeof( F32 );
     memcpy( payloadPtr, &time_min, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
@@ -431,7 +429,6 @@
 BOOL sendChangeTreatmentDurationResponse( BOOL accepted, U32 reason, U32 time_min, F32 volume_mL )
 {
     BOOL result;
-    F32 volume_L = volume_mL / (F32)ML_PER_LITER;
     MESSAGE_T msg;
     U08 *payloadPtr = msg.payload;
 
@@ -446,7 +443,7 @@
     payloadPtr += sizeof( U32 );
     memcpy( payloadPtr, &time_min, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
-    memcpy( payloadPtr, &volume_L, sizeof( F32 ) );
+    memcpy( payloadPtr, &volume_mL, sizeof( F32 ) );
 
     // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
     result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
@@ -508,7 +505,7 @@
  * @param maxDialRate : Maximum dialysate flow rate (in mL/min).
  * @return TRUE if msg successfully queued for transmit, FALSE if not
  *************************************************************************/
-BOOL sendTreatmentParamsRangesToUI( U32 minTime, U32 maxTime, U32 minUFVol, U32 maxUFVol, U32 minDialRate, U32 maxDialRate )
+BOOL sendTreatmentParamsRangesToUI( U32 minTime, U32 maxTime, F32 minUFVol, F32 maxUFVol, U32 minDialRate, U32 maxDialRate )
 {
     BOOL result;
     MESSAGE_T msg;
@@ -517,16 +514,16 @@
     // create a message record
     blankMessage( &msg );
     msg.hdr.msgID = MSG_ID_TREATMENT_PARAM_CHANGE_RANGES;
-    msg.hdr.payloadLen = sizeof( U32 ) + sizeof( U32 ) + sizeof( U32 ) + sizeof( U32 ) + sizeof( U32 ) + sizeof( U32 );
+    msg.hdr.payloadLen = sizeof( U32 ) + sizeof( U32 ) + sizeof( F32 ) + sizeof( F32 ) + sizeof( U32 ) + sizeof( U32 );
 
     memcpy( payloadPtr, &minTime, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
     memcpy( payloadPtr, &maxTime, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
-    memcpy( payloadPtr, &minUFVol, sizeof( U32 ) );
-    payloadPtr += sizeof( U32 );
-    memcpy( payloadPtr, &maxUFVol, sizeof( U32 ) );
-    payloadPtr += sizeof( U32 );
+    memcpy( payloadPtr, &minUFVol, sizeof( F32 ) );
+    payloadPtr += sizeof( F32 );
+    memcpy( payloadPtr, &maxUFVol, sizeof( F32 ) );
+    payloadPtr += sizeof( F32 );
     memcpy( payloadPtr, &minDialRate, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
     memcpy( payloadPtr, &maxDialRate, sizeof( U32 ) );