Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -r7fa65a3aae9c4ef70a6e53f3e3bb20f0425bd681 -re197cc27ab80e2250597746427725671f3491945
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision 7fa65a3aae9c4ef70a6e53f3e3bb20f0425bd681)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision e197cc27ab80e2250597746427725671f3491945)
@@ -43,7 +43,7 @@
 #define MIN_TREATMENT_TIME_MINUTES              ( 1 * MIN_PER_HOUR )                        ///< Minimum treatment time (in minutes).
 #define MAX_UF_RATE_ML_MIN                      ( (F32)2500 / (F32)MIN_PER_HOUR )           ///< Maximum ultrafiltration rate (in mL/min).
 #define MAX_UF_VOLUME_ML                        ( 8 * ML_PER_LITER )                        ///< Maximum ultrafiltration volume (in mL).
-#define MAX_DIALYSATE_VOLUME_ML                 ( 180 * ML_PER_LITER )                      ///< Maximum dialysate volume (in mL).
+#define MAX_DIALYSATE_VOLUME_ML                 ( 150 * ML_PER_LITER )                      ///< Maximum dialysate volume (in mL).
 
 #define USER_CONFIRM_CHANGE_TIMEOUT_MS          ( 60 * MS_PER_SECOND )                      ///< Require user to confirm UF volume change within this time.
 #define PREVENT_UF_VOL_CHANGE_IF_NEARLY_DONE_SEC    ( 10 * SEC_PER_MIN )                    ///< Prevent UF volume change if treatment within this much time from end of treatment (in seconds).
@@ -588,7 +588,7 @@
         }
     }
     // respond to UF settings change confirmation
-    sendChangeUFSettingsResponse( result, rejectReason, presMaxUFVolumeML, presTreatmentTimeSecs / SEC_PER_MIN, presUFRate, 0, 0, oldUFRate );
+    sendChangeUFSettingsOptionResponse( result, rejectReason, presMaxUFVolumeML, presTreatmentTimeSecs / SEC_PER_MIN, presUFRate );
 
     return result;
 }
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r7fa65a3aae9c4ef70a6e53f3e3bb20f0425bd681 -re197cc27ab80e2250597746427725671f3491945
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 7fa65a3aae9c4ef70a6e53f3e3bb20f0425bd681)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision e197cc27ab80e2250597746427725671f3491945)
@@ -327,7 +327,7 @@
  * @details
  * Inputs : none
  * Outputs : UF change settings response msg constructed and queued.
- * @param accepted : alarm status record
+ * @param accepted : T/F - are settings ok?
  * @param reason : reason rejected (if not accepted)
  * @param volume_mL :
  * @param time_min :
@@ -373,13 +373,56 @@
 
 /*************************************************************************
  * @brief
+ * The sendChangeUFSettingsResponse function constructs a UF change settings \n
+ * option response to the UI and queues the msg for transmit on the appropriate CAN \n
+ * channel.
+ * @details
+ * Inputs : none
+ * Outputs : UF change settings option response msg constructed and queued.
+ * @param accepted : T/F - are settings ok?
+ * @param reason : reason rejected (if not accepted)
+ * @param volume_mL :
+ * @param time_min :
+ * @param ufRate_mL_min :
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+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;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_USER_UF_SETTINGS_CHANGE_CONFIRMATION_RESPONSE;
+    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 ) + sizeof( F32 ) + sizeof( U32 ) + sizeof( F32 );
+
+    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
+    payloadPtr += sizeof( BOOL );
+    memcpy( payloadPtr, &reason, sizeof( U32) );
+    payloadPtr += sizeof( U32 );
+    memcpy( payloadPtr, &volume_L, sizeof( F32 ) );
+    payloadPtr += sizeof( F32 );
+    memcpy( payloadPtr, &time_min, sizeof( U32 ) );
+    payloadPtr += sizeof( U32 );
+    memcpy( payloadPtr, &ufRate_mL_min, 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 );
+
+    return result;
+}
+
+/*************************************************************************
+ * @brief
  * The sendChangeTreatmentDurationResponse function constructs a treatment \n
  * duration change response to the UI and queues the msg for transmit on the \n
  * appropriate CAN channel.
  * @details
  * Inputs : none
  * Outputs : treatment duration change settings response msg constructed and queued.
- * @param accepted : alarm status record
+ * @param accepted : T/F - are settings ok?
  * @param reason : reason rejected (if not accepted)
  * @param time_min : alarm status record
  * @param volume_mL : alarm status record
@@ -419,7 +462,7 @@
  * @details
  * Inputs : none
  * Outputs : Blood & dialysate rate change response msg constructed and queued.
- * @param accepted : alarm status record
+ * @param accepted : T/F - are settings ok?
  * @param reason : reason code for rejection or unused if accepted
  * @param bloodRate : new blood flow rate
  * @param dialRate : new dialysate flow rate
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r7fa65a3aae9c4ef70a6e53f3e3bb20f0425bd681 -re197cc27ab80e2250597746427725671f3491945
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 7fa65a3aae9c4ef70a6e53f3e3bb20f0425bd681)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision e197cc27ab80e2250597746427725671f3491945)
@@ -64,6 +64,8 @@
 BOOL sendChangeUFSettingsResponse( BOOL accepted, U32 reason, F32 volume_mL, U32 time_min, F32 ufRate_mL_min, S32 timeDiff, F32 rateDiff, F32 oldUFRate_mL_min );
 // MSG_ID_USER_CONFIRM_UF_SETTINGS_CHANGE
 void handleChangeUFSettingsConfirmation( MESSAGE_T *message );
+// MSG_ID_USER_UF_SETTINGS_CHANGE_CONFIRMATION_RESPONSE
+BOOL sendChangeUFSettingsOptionResponse( BOOL accepted, U32 reason, F32 volume_mL, U32 time_min, F32 ufRate_mL_min );
 
 // MSG_ID_USER_TREATMENT_TIME_CHANGE_REQUEST
 void handleChangeTreatmentDurationRequest( MESSAGE_T *message );