I looked at your prior thread. If your roots have now dried into papery sheath, that's not overwatering. Mushy roots, probably. Yeah, twice a day is a bit too much. Ditto what Ray says on roots tailoring to a new environment that's radically different.

I've transferred tightly packed soppy sphagnum moss from grocery store type packaging into semi-hydro and not suffered much root loss. But that's an entirely different story. From a wetter environment to drier, yes, awaiting new root growth helps a lot. I would not use water culture to get roots growing. You need to concentrate on having them survive in the medium you want to use. That leads back to what Ray says about roots growing adapting to your culture. Get the humidity high with the baggie over it, or a glass vase or whatever fits. Remember to remove occasionally. When I use a container over the top, I leave an air gap... like set container on a couple of chopsticks, flat rocks, whatever, so there's still air exchange.

When the 8-12 hours of root soaking is over, should I empty all of the water from the glass? How many days until the next full soak?

Hi there. I can’t answer about semi hydro. I’m just trying to understand how the roots could have all been lost. Some older roots to tend to die off after repotting and some mold is also common. I use clear plastic pots a lot so I can see the progress.

Maybe it could be sudden chemical changes in the pot as well as general acclimation to your water and environment. I read somewhere that orchiata bark tends to be alkaline and older sphagnum moss tends to get acidic. It’s good to know the ph level of the water you’re using if you’re using tap. I had a phal in mostly orchiata bark that wasn’t growing as well as the other ones. If anyone else has some input on orchiata, I’d love to know.