That's a very nice article, Ray. In my eyes, there are 2 steps to finding if your water is good for orchids. The first is to have a sample analyzed. The second is to discuss the results with someone who is knowledgeable in interpreting it. A local university usually has someone qualified to do this and often for a minimal amount. Water quality and fertilizer use is the least understood part of orchid growing and is often the difference between a plant that grows and flowers poorly and one that is a show stopper.