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Jessie, I don't know the science behind it but adding a clean/washed sea shell (clam shell) - does something magical and the scale is removed faster, especially in a stove top tea kettle. I think it has something to do with the calcium in the shell.
DIY Wood Fired Cedar Hot Tub
The debate about whether a coil would cause one or more bad things to happen reminded me of a corporate paradigm that you can see played out entirely in this comments thread. It is appropriate that those that dismiss the idea of this common technique ....are called resisters.
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