Index: firmware/App/Controllers/SpentChamberFill.h
===================================================================
diff -u -rc07917caced76b53a0ed8f35167fac6f9d8310a4 -rf4a8565c7edec12094b8a737ed7b8cd3424a9208
--- firmware/App/Controllers/SpentChamberFill.h	(.../SpentChamberFill.h)	(revision c07917caced76b53a0ed8f35167fac6f9d8310a4)
+++ firmware/App/Controllers/SpentChamberFill.h	(.../SpentChamberFill.h)	(revision f4a8565c7edec12094b8a737ed7b8cd3424a9208)
@@ -8,7 +8,7 @@
 * @file    SpentChamberFill.h
 *
 * @author  (last)      Vinayakam Mani
-* @date    (last)      26-Aug-2025
+* @date    (last)      13-Nov-2025
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  21-Aug-2025
@@ -33,7 +33,7 @@
 
 #define FRESH_DIAL_FILL_PRESSURE_MIN_PSIG          22.0F                ///< Minimum fresh dialysate pressure (D18) limit for spent chamber fill operations.
 #define FRESH_DIAL_FILL_PRESSURE_MAX_PSIG          30.0F                ///< Maximum fresh dialysate pressure (D18) limit for spent chamber fill operations.
-#define SPENT_DIAL_FILL_PRESSURE_MIN_PSIG          24.0F                ///< Minimum spent dialysate pressure (D51) limit for spent chamber fill operations.
+#define SPENT_DIAL_FILL_PRESSURE_MIN_PSIG         -10.0F                ///< Minimum spent dialysate pressure (D51) limit for spent chamber fill operations.
 #define SPENT_DIAL_FILL_PRESSURE_MAX_PSIG          30.0F                ///< Maximum spent dialysate pressure (D51) limit for spent chamber fill operations.
 
 /// spent chamber fill data structure