Hi folks,
it's impossible for sodium or potassium to be absorbed into your skin while showering or bathing. Our bodies are designed to protect itself in this respect. What happens from time to time is the reverse...We perspire and excrete sodium. If you are on a sodium restricted diet and drink softened water out of your bathroom faucet, for example, it's the equivalent of a 8oz glass of milk with 20 gpg hardness. In many cases, it is not a significant source of sodium but as with any health issue, please consult with your medical practicioner for the best advice for your case.
Since your kitchen cold is bypassed, you may want to consider a reverse osmosis drinking water system for high quality water.
Fyi...Potassium chloride is less efficient in softening water versus sodium salt and more expensive. If you choose to use it, you'll need to adjust your salt dosage setting up by 1/3 and limit filling the salt tank to 1/2 way up because potassium salt has a tendency to "mush" at the bottom of the salt tank, requiring more potential service of your softener system. Please drop a line on the forum if you have any other questions. Good luck out there!
Art