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They'll probably use a combination of things like zeolites which absorb and de-activate the radiation from the water. That's what TEPCO is currently doing now in the sea water around Fukushima: http://nuclearstreet.com/nuclear_power_industry_news/b/nuclear_power_news/archive/2011/04/25/containment-flooding-progresses_2c00_-groundwater-barrier-proposed-at-fukushima-daiichi042502.aspx