I'm afraid I'm too ADD right now to get all the way caught up in your journal, but I'm battling hard water right now in Maine. Boiling water for pre-mixed baking soda shampoo worked for me. I boiled it for 10-ish minutes and mixed in the baking soda, making sure to leave the white bits in the bottom in the mixer, not on my head. I also shampooed before I even got in the shower to keep it "pure." Mine was still warm when I used it, so I'm not sure how it would work to mix a lot ahead and use it cold.