Tim , really any well made soap will work with hard water. Some better than others it just takes getting the water ratio right and in my experience a great soap just makes hard water a non issue. The area in southeast New Mexico has some of the worst water I've ever dealt with, even some of the crap we had in the Middle East. I used bottled water in the beginning but I just threw all my soaps out and started using MDC. And Castle Forbes face lathered, no issues whatsoever. It's all in the soap. Tc
+1
This is my view as well.
I have conducted approximately five experiments with hard water from a few different areas of the world and I have found no issues loading my soap once I simply modified my technique of loading and working the soap for a bit longer.