Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -rf46193ce4cce48dee728dd93235e0452e8fe1963 -rf7b149d8b8c9ea6ac58e4739101693d251d7a355
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision f46193ce4cce48dee728dd93235e0452e8fe1963)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision f7b149d8b8c9ea6ac58e4739101693d251d7a355)
@@ -295,11 +295,10 @@
             if ( ( DG_MODE_CIRC == getDGOpMode() ) && ( DG_RECIRCULATE_MODE_STATE_RECIRC_WATER == getDGSubMode() ) &&
                   ( resUseVolumeMl >= (F32)dgReservoirFillVolumeTargetSet ) )
             {
-                DG_RESERVOIR_ID_T activeRes = dgActiveReservoirSet;
-                DG_RESERVOIR_ID_T inactiveRes = ( activeRes == DG_RESERVOIR_1 ? DG_RESERVOIR_2 : DG_RESERVOIR_1 );
+                DG_RESERVOIR_ID_T inactiveRes = getDGInactiveReservoir();
 
                 // Signal dialysis sub-mode to capture baseline volume for next reservoir.
-                setStartReservoirVolume();
+                setStartReservoirVolume( inactiveRes );
                 // Command DG to switch reservoirs
                 cmdSetDGActiveReservoir( inactiveRes );
                 // Signal dialysis sub-mode to switch reservoirs