Index: firmware/App/Modes/ModeDrain.c
===================================================================
diff -u -r81769c6bea6ed32d70698fb03ad5823de1814b27 -re95b1d3c47166be8a6852818a70b4c6231881b86
--- firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 81769c6bea6ed32d70698fb03ad5823de1814b27)
+++ firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision e95b1d3c47166be8a6852818a70b4c6231881b86)
@@ -143,7 +143,6 @@
     checkInletWaterConductivity();
     checkInletWaterTemperature();
     checkInletWaterPressure();
-    checkRORejectionRatio();
 
     // execute current drain state
     switch ( drainState )