What is your tap water like? Is it hard (lots of minerals) and/or basic? Does it have a lot of chlorine or other chemicals added to it? If it's hard, basic water, you should be fine, just be sure to flush out the excess mineral deposits about once a month with lots of plain water. If it has a lot of chemicals in it, let the water sit at least overnight to allow the chemicals to leave the water, this will also allow the water to become room-temp, which is better for the plant. I've found my Phal to be pretty tough, which is one reason they're so popular! Personally, I have well water at home, but I'm stuck with municipal water while I'm at college. It doesn't seem to have affected my orchids visibly (I seem to be suffering more from the chemicals than my plants). If you're worried, get a water test kit and see what the pH is. As long as it's close to neutral, you should be fine. Or collect rainwater, but be sure it's still clean after being collected (collecting from your roof would probably make it worse than tapwater!)
And thanks for your original question and the responses to it. I only have one Phal at present, and cut back the spike for a rebloom, which was actually better than the first bloom, but now I want to try cutting all the way back. It's an orchid that I saved from Fred Meyers, so it may have had a good rebloom just because it is still regaining strength, but in the long run it sounds like cutting all the way back preserves that strength.
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