I agree with Elaine. I've read that a once a month watering with high Ph water is a good thing. Our water here is about 7.5Ph in a good year, and I do get lazy and use the hose once in a while. That being said, there are a few orchids that won't tolerate it. My Coel. barbata has black tips on all of the older leaves from it. New growth looks fine since I quit the city water. I use the hose for all of my big terrestrials for convenience, and so far, no negative reactions It's all trial and error.
I was surprised to see my Grubler Pro Mix doesn't have calcium.
