Yesterday I repotted a phalaenopsis that I had potted a year ago in a 5" slotted clear plastic pot. It was in a mixture of medium coconut husk chips with a little charcoal. The pot was completely full of good healthy roots. There wasn't a single dead root on the plant. I was pretty amazed. I've been using these pots for over a year now and they work really well for phals. I always use the smallest pot the roots will comfortably fit in. Here's a picture of 5", 4" and 3" pots that I use. For drier climates the pot without slots, like the 4" pot shown, might be more appropriate.
https://picasaweb.google.com/1043303...59276643226786