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how do you mean adding? like sprinkle a pinch in the bowl when I lather or melt the puck of soap and mix it in or put a pinch in the water when I soak the brush?

and this is why I love this forum. I googled "shaving soap hard water" and this thread showed up.

one question for the chemistry minded: My roommate is a Chem major, and has access to a crapload...