This is so interesting! And great that you manage with the phal in water. As I said in an earlier comment, I've read it's pretty hard and that phals are one of those orchids that does not like water culture very much, but obviously your plant is proving them wrong or being a good example of the exception to the rule.
Well done!
I've got only one plant in water culture at the moment and that's a dendrobium kingianum (of all things). It likes it as well, from the look of it. It grows keikis and new roots. It's a test bunny. It was rootless and I could have opted for different things, but I chose to put it in a jam jar with water.