Index: firmware/App/Modes/ModeDrain.c
===================================================================
diff -u -rdc0d9b087c609e71cacdb7f0395cccf29d749c00 -r92ec01cb48d91fe7315baa987e1aa051dd12df75
--- firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision dc0d9b087c609e71cacdb7f0395cccf29d749c00)
+++ firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision 92ec01cb48d91fe7315baa987e1aa051dd12df75)
@@ -22,8 +22,8 @@
 #include "OperationModes.h"
 #include "Pressures.h"
 #include "Reservoirs.h"
-#include "Valves.h"
 #include "TemperatureSensors.h"
+#include "Valves.h"
 
 /**
  *  @addtogroup DGDrainMode
@@ -44,10 +44,10 @@
 
 /*********************************************************************//**
  * @brief
- * The initOpParamsMode function initializes the Drain Mode module.
+ * The initDrainMode function initializes the drain mode module.
  * @details
  * Inputs : none
- * Outputs : Operating Parameters Mode module initialized.
+ * Outputs : drainState
  * @return none
  *************************************************************************/
 void initDrainMode( void )
@@ -61,7 +61,7 @@
  * mode.
  * @details
  * Inputs : none
- * Outputs :
+ * Outputs : Drain mode initialized
  * @return none
  *************************************************************************/
 void transitionToDrainMode( void )
@@ -76,18 +76,19 @@
 
 /*********************************************************************//**
  * @brief
- * The execDrainMode function executes the Drain Mode state machine.
+ * The execDrainMode function executes the drain mode state machine.
  * @details
- * Inputs : none
- * Outputs :
+ * Inputs : drainState
+ * Outputs : Check water quality, drainState
  * @return current state.
  *************************************************************************/
 U32 execDrainMode( void )
 {
-    // check inlet water conductivity, temperature, and pressure
-    checkInletWaterConductivity( drainState );
+    // check inlet water conductivity, temperature, pressure, and RO rejection ratio
+    checkInletWaterConductivity();
     checkInletWaterTemperature();
     checkInletPressure();
+    checkRORejectionRatio();
 
     // execute current drain state
     switch ( drainState )
@@ -111,11 +112,11 @@
 
 /*********************************************************************//**
  * @brief
- * The handleDrainState function handles the drain state  of the Drain Mode \n
+ * The handleDrainState function handles the drain state  of the drain mode \n
  * state machine.
  * @details
  * Inputs : none
- * Outputs :
+ * Outputs : Drain out from reservoir
  * @return the next state
  *************************************************************************/
 static DG_DRAIN_STATE_T handleDrainState( void )