Hello Eric, My middle name is Eric. As you suggest I think this problem comes from one of the sources you mention above. I enjoy long soaks down there at DCHS so I'm hoping this problem goes away, not yet aparently. You say you live in Northern California. We have bought some land about 18 miles northeast of Redding Cal just off HWY 299. A small ( very small ) community called Ingot on 299 is close by. Do you know of any hotsprings close to that area. When we move there someday it would be nice to have a place to soak nearby. Thanks for any info you may have on this subject :-)