Index: firmware/App/Modes/ModeDrain.c
===================================================================
diff -u -r6499ea25921fcf67826fa0c35bb03caf411ba542 -r2c08db070a6e09306caf461e7aceeb53097fd995
--- firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 6499ea25921fcf67826fa0c35bb03caf411ba542)
+++ firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 2c08db070a6e09306caf461e7aceeb53097fd995)
@@ -143,7 +143,6 @@
     checkInletWaterConductivity();
     checkInletWaterTemperature();
     checkInletWaterPressure();
-    checkRORejectionRatio();
 
     // execute current drain state
     switch ( drainState )