By popular request, a link to my water chemistry spreadsheet (if you don’t notice immediately, there’s multiple pages there).
Like I said, I don’t use it much, and I overshot the history. Seems I went back 6 years, not 10 years. But it still took a while.
Don’t know how much use it’ll be to y’all, it’s very messy and data specific, and possibly someone a little more tech savvy can make a more fluid one. But it works for me.