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My old timer (30+ years rv'ing) says not to be too quick replacing them. He says they actually work better when they get a little worn out because there is more surface area on a lumpy/bumpy one than a new one. Obviously, if it starts looking like it might break, change it. Just one old guys opinion, but that's what this forum is all about, right? Definitely drain and flush the tank as needed depending on how much you use the unit. If it's going to sit for more than a couple of weeks, drain it.
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