I agree with all of what OW said. Phals grow where they want to grow. Three years in a pot is a long time, and it's likely that a lot of the bark inside the pot has broken down. If I use plastic pots then they are basket pots, which allow gobs of air to the roots and dry the material quite quickly, but also encourage absurd root growth; for Phals I prefer either terra cotta or to mount. Phals, even in bloom, tolerate a repotting any time, so now's as good as any. In my experience Phals like to be slightly pot-bound and so I tend to use the smallest pot the roots will comfortably fit into.
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