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I use 5ft hoses. The ends will get rusty over time and when they look bad to me, I get them replaced. I used 6ft before, and it seemed to take forever for the vinegar to start to flow through them....

I do all the tankless maintenance and service calls where I work. I just flush it out with white vinegar using a discharge only pump through the cold water isolation valve via a hose. I recirculate...