Each year you have to start again with clean wicks. But you do not have to buy new ones. You can reuse the wicks eternally if you clean them well. Please put the wicks in a washing machine. Add some soap, wash them with a short program (app. 30 minutes) at 40 ⁰Celsius (104 ⁰Fahrenheit).

Then you put them in the Waterboxx again.