If I am watering at the sink I always run water over the arial roots as well. If I'm filling the pot from a watering can, then tipping out the water a few minutes later then it again depends if I am going to the sink to empty them (if so I poor the water I'm emptying out the pot over the arial roots).
Some of mine are so used to that that the arial roots turn a lovely green when I do, other Phals that had existing arial roots don't seem to absorb as much that way but I still do it.
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