| If you truly only have a couple of viable roots remaining I would go down a pot size. Overpotting makes it very easy to overwater because there is too much media to retain water in the pot, and too few roots to absorb it.
A little tip for removing old media from a root ball: soak the entire root ball in luke warm water for a while and then run a little stream of water over the area you are working on at the time. this helps to keep the roots pliable and rinses away loose materail.
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