Here’s the link. Sounds like there must be more than one isotope of Tritium in play because this is the statement saying they can’t remove it from water:
http://fukushima-diary.com/2013/09/jp-gov-there-is-no-technology-to-remove-tritium-from-contaminated-waterappeal-international-world-for-technology/
Hydrogen only has two isotopes, Tritium and Deuterium.