Typical causes of cracked tubing may include high exposure to sunlight and heat, and common use of harsh detergents and bug spray on and around the tubing. Also, keep in mind that bacteria could grow in the water within the outlet tubing and diverter, if the eSpring unit is inactive. A 30-second flush can help to clear all this water out of the system, replacing it with water treated by the UV Lamp. It is recommended to replace eSpring Tubing at least every two years or earlier for hygiene purposes.