Testing my water
I think this is a good idea.
The portion of my property where my house and well are located is solid limestone, and the well is 70 feet deep.
Because of my location and the depth of the well, I don't fear industrial or agricultural contaminants, so the usual causes of well-water-related illnesses are unlikely, but I've always had ridiculously hard water and no water softener.
The limestone definitely hardens my water, creates quite a bit of build up, and makes my water decidedly alkaline (which is probably why vinegar -- dilute acetic acid -- helps).
I'll check out Home Depot, and I'll call my County Agent (I always hesitate to do this, since I always imagine I'll end up talking to Hank Kimball).
On another note, I'm a bit surprised at the vehement anti-Cascade sentiment expressed by Laundromat. I've certainly never studied this, but as I said in my OP, I have been using Cascade in these dishwashers with these same glasses for over 17 years, and they haven't been damaged.
I'll freely admit that I haven't done any comparisons of dishwashing detergents, but I've never had any problems in the past. Other products may well be better, and I'm more than willing to switch, but my Libbey Accent glasses have survived the experience intact, if sometimes a bit milk-stained.
Let me know what the best automatic dishwashing detergent available in my area is, and I'll gladly try it.
-kevin