Roy,

I have heard of some people soaking their vandas in a large trash barrel
and fertilizing at the same time. I have not used this approach as I
have seen too many wet crowns cause the withering and dying of the
vanda. So, I spray the roots on a daily basis and then allow the
drippers to water them on their cycle. I don't know whether or not the
roots are supposed to turn completely green, though.

.. . . Pam
Everything Orchid Management System
http://www.pe.net/~profpam/page3.html

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Roy wrote:

I have been told to water Vanda roots until their color become
completely dark green.
I have tried to water the roots 5 times with 5 minutes interval;
I even soak one of them in a glass for 30 minutes.
I can not make them turn completely green; there are still white
blotch on the roots especialy near the root tips.
Is there a good way to saturate the root until completely dark green
(I do not use any potting media)?