Matt this is from CoolWorks Web sight
Situation: The coating on the probe is compromised or flaking.
The IceProbe’s solid aluminum probe is coated with a very durable FDA compliant material. Care should always be taken when handling and installing the IceProbe to ensure that this coating is not scratched or chipped. If the coating is compromised, the underlying aluminum may begin to corrode and the coating may eventually fail. While failure of the coating material degrades the appearance of the probe, it will not affect the IceProbe’s cooling performance or the watertight seal. While aluminum exposure is generally considered safe (e.g. aluminum cookware), you may want to confirm that direct aluminum contact is acceptable in your application.
IceProbe Thermoelectric Aquarium Chiller :: CoolWorks Inc