Thanks for the replies!
I've gone off and read the Ditra handbook install notes on the Schluter site. It would seem that the thinset that I already have is not recommended?
I have what I trust to be "modified" thinset: Superior's Pro Flex Platinum "Latex Fortified Thinset Mortar", least that's what I can read off the bag. (sold by the Tile Shop)
Is this useful here? Which layer? Floor - Ditra or Ditra - Marble? Any advice?
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