What I sometimes do with Phals whose roots are growing out of the bottom of the pot or otherwise going wild, is to just drop it into a slightly larger pot, with no medium. The space between the pots tends to stay a little humid, and it's a place to control the roots without changing their environment. (Santa Barbara Orchid Estate does this with Catts, just dropping the whole thing into the next size empty pot. I have gotten plants from them where, upon repot, I found the original back part (roots mostly gone) in maybe 2 small pots, and then maybe 3 or 4 beyond that were just full of roots between the pots. After all, these are air plants... with that bit of humidity held between the pots, they grow very well.
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