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Warning man, just do not let it go to soft. OMG that sucked having soft water. Felt like you always had soap on your skin when you were in the shower or tub.
As for your question. Go with sodium, it is less prone to caking or build up than potassium. Otherwise they are pretty much identical. Unless of course potassium costs more than sodium for refills.
I am almost also positive you can run potassium in a sodium unit and vice versa. Though I am sure most manufacturers would frown on it.
I also have an issue health wise with potassium that may or not be founded on reality. Yet I have no health issues with sodium chloride.
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