A medical drainage tube for transporting liquid from a liquid source to a liquid storage device, the medical drainage tube includes an inner surface which defines a lumen; an inlet for coupling to a liquid source and for receiving liquid into the lumen from the liquid source; an outlet for coupling to a liquid storage device and for transporting the received liquid from the lumen to the liquid storage device; and an indicator including an indicating agent which, when the medical drainage tube is in use, is configured to dissolve after being exposed to the liquid for at least 24 hours, thereby providing a trigger which notifies a user that the medical drainage tube requires replacement.