Index: firmware/App/Modes/ModeDrain.c
===================================================================
diff -u -r6499ea25921fcf67826fa0c35bb03caf411ba542 -r5c430c3ac17fc8ad836fd70b8a3b8a12af44319e
--- firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 6499ea25921fcf67826fa0c35bb03caf411ba542)
+++ firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 5c430c3ac17fc8ad836fd70b8a3b8a12af44319e)
@@ -143,7 +143,6 @@
     checkInletWaterConductivity();
     checkInletWaterTemperature();
     checkInletWaterPressure();
-    checkRORejectionRatio();
 
     // execute current drain state
     switch ( drainState )