Coils should be replaced at least every three months, or more often with heavy use.
Your system will perform better if you use the ICES Coil Life Tester to check your coils before each use, and replace the coils as necessary.
Because coils may come in contact with skin and bodily fluids, it is recommended to not share coils between different individuals.
Coils are designed to be soft and flexible and very light, so they will wear out with use. Please check them often and replace as necessary.