We highly recommend following the safety and hygiene guide provided by W.H.O. and CDC. They recommend all pump parts be washed thoroughly and sterilised before/after every use. This would help protect babies from comin in contact with germs.
Do note that refrigerating pump parts does not stop bacterial growth. Babies can become ill from contaminated milk due to bacteria grown on pump parts that were not properly cleaned. For more information, you can refer to CDC's website.
Unlike traditional breast pumps, our pump motor is connected directly to the pump parts. Refrigerated pump parts when brought out to room temperature may form condensation and any condensation on the diaphragm may get sucked into the pump motor. This will damage the pump motor and cause it to malfunction.