What I'm going to suggest is somewhat off the topic. I had a water purified system install for the entire house, which was not cheap. Twice a year someone comes out and replaces my filter for $100, something I could do myself if I wasn't so lazy. Now the reason I'm bringing this up is when they installed it, they cleared my hot water tank and told me that it would never have to be clear again. Now you might believe that was just a sales pitch, but I was also changing my refrigerator water filter every 6 months. My frig would give me a warning that the filter had to be change and of course I would ignore it, until the flow would start to slow down to a trickle. I haven't changed it in years. Maybe you should look into this, not only will you not have to clear your tank every so many years, but you'll also have clean water running throughout your house.
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