Fresenius Medical Care Liberty Select User Manual page 194

Note: If you bypass during a Fill or Dwell, you will
either not receive your programmed amount of
dialysate or not have as much time to filter out the
waste. Your treatment may not be as effective. The
letter 'B' will be displayed next to your treatment
details in the "My Records" screen to show a bypass
occurred. For more information, see "Treatment
Details" on page 176.
192 P/N 480145 Rev A Liberty Select Cycler User's Guide