Index: firmware/App/Services/PIControllers.c
===================================================================
diff -u -r52362c924eb6233f0a23f6978ea3ce6a2b1b9376 -r24b2fe72608344e67ef37234085d15ad5e4fcc37
--- firmware/App/Services/PIControllers.c	(.../PIControllers.c)	(revision 52362c924eb6233f0a23f6978ea3ce6a2b1b9376)
+++ firmware/App/Services/PIControllers.c	(.../PIControllers.c)	(revision 24b2fe72608344e67ef37234085d15ad5e4fcc37)
@@ -1,17 +1,17 @@
 /**************************************************************************
 *
-* Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2019-2022 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 PIControllers.c
+* @file    PIControllers.c
 *
-* @author (last) Sean Nash
-* @date (last) 13-Aug-2020
+* @author  (last)      Sean Nash
+* @date    (last)      02-Jul-2021
 *
-* @author (original) Sean
-* @date (original) 27-Dec-2019
+* @author  (original)  Sean
+* @date    (original)  27-Dec-2019
 *
 ***************************************************************************/
 
@@ -64,7 +64,7 @@
 /// PI Controllers -- initial configurations.
 static PI_CONTROLLER_T piControllers[ NUM_OF_PI_CONTROLLERS_IDS ] =
 {   // Kp   Ki  uMax  uMin  ref meas  err  esw esum ctrl  Ilimit controller type
-    { 0.0, 0.0, 0.90, 0.10, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 50.0,  CONTROLLER_UNIDIRECTIONAL },  // PI_CONTROLLER_ID_ULTRAFILTRATION
+    { 0.0, 0.0, 0.90, 0.10, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 50.0,  CONTROLLER_BIDIRECTIONAL },   // PI_CONTROLLER_ID_ULTRAFILTRATION
     { 0.0, 0.0, 0.90, 0.10, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0, CONTROLLER_UNIDIRECTIONAL },  // PI_CONTROLLER_ID_BLOOD_FLOW
     { 0.0, 0.0, 0.90, 0.10, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0, CONTROLLER_UNIDIRECTIONAL }   // PI_CONTROLLER_ID_DIALYSATE_FLOW
 };