I am not sure if they are planning to reuse decontaminated water or not. It might very well still be full of oil etc. I believe they may try to find away to pump already contaminated water from below the reactors back into the top, while they are working on any excess by decontaminating it and releasing it into the sea (nowhere else to release it even though it won't be completely safe).

Or at least that's my read right now. I am not as up to the minute as I was in those first few weeks. I just spent the last half hour reading over my ramblings here since I started posting about the situation. Crazy stuff.
We are what we repeatedly do - Aristotle