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  1. Appliances
    How does it manifest itself if the anode is bad? What are the symptoms? How often should it be replaced?
  2. Plumbing
    The sacrificial anode on my (gas-fired) hot water heater has a hex head on it, so it looks like it could be replaced. Am I right? If I replace it, say, every 2 or 3 years with a new one (where would I buy a new one?), would that extend the life of the unit?
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