It is likely not salt in the water heater. In my previous home, I was told to periodically drain the hot water tank to remove the accumulation of those whitish deposits. They blamed it on the softener. I drained the tank every six months and got a lot of those deposits out. But, for me, the heater worked better afterwards because the flame didn't have to heat through the debris in the bottom of the tank.
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"the difference between genius and stupidity is that genius has its limits."
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