Let's clear up some confusion here. There are not air roots and roots in the media. They are one and the same. Most orchids grow on trees and rocks with no soil. Just leaf litter and lichens. Their roots grow along whatever they are growing on and get their moisture from rain, mist, and humidity. Phals like high humidity but not wet roots. As long as the plant is kept out of contact with the water, it should be ok. But that being said, the plant must be monitored carefully at first so it can be evaluated for moisture content of the media. Having water near the roots may inhibit them from drying out and causing rot. Watch it closely. As form cutting the old flower stems, if you want a second blooming, cut an inch above the first or second node or swelling on the stem. But I prefer to cut the old stem off an inch above the base of the stem and let the plant rest.
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mothinuk 
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