Index: firmware/App/Controllers/SpentChamberFill.h
===================================================================
diff -u -re6415d33321e7990c3b5e82b0c8a87c64cc3a2c8 -r830213bc6dcc1a684610caf78c79d55f2cb41e93
--- firmware/App/Controllers/SpentChamberFill.h	(.../SpentChamberFill.h)	(revision e6415d33321e7990c3b5e82b0c8a87c64cc3a2c8)
+++ firmware/App/Controllers/SpentChamberFill.h	(.../SpentChamberFill.h)	(revision 830213bc6dcc1a684610caf78c79d55f2cb41e93)
@@ -1,17 +1,17 @@
 /**************************************************************************
 *
-* Copyright (c) 2024-2025 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2025-2026 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * @file    SpentChamberFill.h
 *
 * @author  (last)      Vinayakam Mani
-* @date    (last)      20-Aug-2025
+* @date    (last)      13-Nov-2025
 *
 * @author  (original)  Vinayakam Mani
-* @date    (original)  20-Aug-2025
+* @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