If some mold was growing..... I normally just spray with a fungicide. We have in our area products like mancozeb and yates anti-rot. Then just put the plants in dry new lava rock and allow the roots to dry for a day or so....allowing the treatment to work a bit. I grow all my catts in lava rock. Just water normally after that.... making sure the pot is an excellent draining one... lots of holes in the bottom for very good drainage. Put the orchid in shade .... with medium filtered light and very good air circulation. I also use root promoting gel.... called ezi-root gel..... which might be sold where you are... but maybe similar products available.
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