Index: firmware/App/Controllers/ConductivitySensors.c
===================================================================
diff -u -rd4e5e5e155cd938823ee8eb8b090355e1fcc37a2 -r41c7186ac17200977b632102c9c6e3a07b3eb211
--- firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision d4e5e5e155cd938823ee8eb8b090355e1fcc37a2)
+++ firmware/App/Controllers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision 41c7186ac17200977b632102c9c6e3a07b3eb211)
@@ -216,9 +216,11 @@
  *************************************************************************/
 void checkRORejectionRatio( void )
 {
+#ifndef DISABLE_DIALYSATE_CHECK
     F32 const cpo = getConductivityValue( CONDUCTIVITYSENSORS_CPO_SENSOR );
     BOOL const isRORejectionRatioOutOfRange = ( roRejectionRatio > MAX_RO_REJECTION_RATIO_ALLOW ) || ( cpo >= MAX_CPO_CONDUCTIVITY_ALLOW );
     checkPersistentAlarm( PERSISTENT_ALARM_RO_REJECTION_RATIO_OUT_OF_RANGE, isRORejectionRatioOutOfRange, roRejectionRatio );
+#endif
 }
 
 /*********************************************************************//**