Citric Acid Method

1. Combine a 10g packet of citric acid and 200 mL of water. 
Remove the sterilizer's cover and transfer the mixture to the empty machine. 
Citric acid is available at pharmacies.

2. Turn on Mode 1. 
Allow the sterilizer to run uncovered for one to two minutes.

3. Disconnect the unit and set it aside for half an hour.

4. Pour out the citric acid mixture and run clean water through the sterilizer.

5. Replace the cover and activate a complete sterilizing cycle using precisely 90 mL of water. 
Do not attempt to sterilize any bottles or other equipment at this time.