Absolutely. After testing our tap and finding it having a pH of 10.0 I just could not believe it. I went to our water company's web site for a water properties print out, and sure enough, our water pH averages 9.8 to 10.0. I think everyone should test their water source. You can get the test strips from aquarium supply stores, among other sources and they are relatively inexpensive. The way I see it, without the proper pH, you are simply wasting your time feeding your orchids.