Phal roots don't have hair. They are a smooth spongy cover that when wet turn a plump green and when dry are a silvery white colour. Old roots can still be healthy but take on a bit of brown colouring from bark and weathering if on top of the pot. Fuzz can be mould, mealy bugs or immature scale. Look for small round dots on the stem and underside of leaves to see mature female scale. The immature look exactly like white mould. Mealies are white and fuzzy but you can usually see the individual bugs as they are rather large. Maybe babies look like this, not sure.
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