Welcome! Running water over the medium especially over fresh chunky bark means less water gets absorbed. Dunking the pot will expose the bark medium to water for longer and let it absorb. If you prefer to water frequently then running water over the top will be fine. But if you prefer to water less often then dunking will be better. Phals grow fairly slowly and I have other orchids to attend to so I prefer to dunk or thoroughly water once a month. The rest of the time, I run some water over the medium because it’s less time consuming. Those phal pots can get pretty big and moving them to the sink can be time consuming. It is however necessary when you want to remove excess salts from the medium.
I usually avoid watering directly over the crown because I’m concerned about crown rot. But sometimes some water does get in the crown. I wipe the excess away with a paper towel but a little bit probably isn’t a problem.
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~Tina
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