We recommend you clean both water tanks once a week with soap and water. Make sure you wash your hands before touching the inside of the water tanks to avoid contamination, especially of your clean water tank.
If you have hard water, or if you do not wash your tanks regularly, you may notice that your tap water tank may develop some scaling, or mineral build-up. If this does not come off easily with soap and water, we recommend soaking the tank in a 50/50 solution of distilled vinegar and warm water for 10-15 minutes, then wash clean with soap and water.