Do you mean removing the roots that are rotten? Usually, I just pull those off. Healthy roots are best left untrimmed as cuts/broken roots can offer a pathway for fungus to attack the roots...which can lead to the roots rotting. If you break any roots and don't want to use a fungicide, pot it in dry medium (I use LECA or red lava rock) and let it sit for a day or two to let the roots heal. That is what I do so that I don't lose the roots after I re-pot.
Good luck!
---------- Post added at 11:07 PM ---------- Previous post was at 10:59 PM ----------
Concerning the type of pot, it just depends on how you grow your orchid. You could use a glass vase if you have very warm temperatures, use a large medium (like red lava rock) that allows plenty of air around the roots and make certain all the water is dumped out after watering.
Most Phals grow clinging to rocks or trees in very hot, humid and breezy environments, hanging sideways or upside-down. After it rains, the roots and leaves dry very quickly but the air is always humid. There are no rules on how you accomplish replicating this environment for your orchid...it depends upon your conditions. If you have cooler temperatures, you really need a pot with holes or the roots will rot. If you have a warm environment (above 75'F), this isn't quite as important as the medium will dry faster.
Good luck!
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