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dpam,
Your friend is right. That rod can look really bad and still be good, it's when a fair amount of the core rod is visible that you need to change it. As Art mentioned how long a rod lasts depends on the water source, is 6 years of fulltiming we have only had to replace our rod one time. If you are constantly using a bad water source the rod won't last that long. If fulltiming I should think checking every 6 months is fine, otherwise yearly should do as the rods don't dissolve quickly.
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