Do I need to winterize my water-fed pole system?

Hello, quick question, during the winter is there some type of winterizing I should be doing for my water-fed pole system? I've had it for 3 years and have never winterized it during the winter months. I live in NJ where it gets too cold to use it for at least 2 months during the winter. It has RO, DI on it. It is stored in a heated garage.
 
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