Index: MessagePayloads.h
===================================================================
diff -u -rb218e277609255d214d95383f9de8eedb64af6c7 -r3bb1504f8f50007433c0875b26b90985bd021b0a
--- MessagePayloads.h	(.../MessagePayloads.h)	(revision b218e277609255d214d95383f9de8eedb64af6c7)
+++ MessagePayloads.h	(.../MessagePayloads.h)	(revision 3bb1504f8f50007433c0875b26b90985bd021b0a)
@@ -42,8 +42,10 @@
     F32  ufRate;                                        ///< Set ultrafiltration rate (mL/min).
     F32  dialTemp;                                      ///< Set dialysate temperature (deg C).
     BOOL bypassDialyzer;                                ///< Flag indicating whether bypass of dialyzer is requested.
-    U32  acidType;                                      ///< Type of acid being used to make dialysate.
-    U32  bicarbType;                                    ///< Type of bicarb being used to make dialysate.
+    U32  acidKPlus;                                     ///< Set acid K+ being used to make dialysate.
+    U32  acidCa2Plus;                                   ///< Set acid Ca2+ being used to make dialysate.
+    U32  sodium;                                        ///< Set sodium being used to make dialysate.
+    U32  bicarbonate;                                   ///< Set bicarbonate being used to make dialysate.
 } DIALYSATE_DELIVERY_REQ_PAYLOAD_T;
 
 /// Payload record structure for requesting pre generate dialysate.