Treating water bodies comprises introducing a feed material containing an unburned lime product into the water bodies to be treated, where the unburned lime product has a grain size of less than approximately 10 mu m and is present in an amount of = 50%. Independent claims are also included for: (1) an aqueous suspension comprising at least one unburned lime product, which is used for treating water bodies; and (2) a water-craft for introducing the unfired lime product as feed material into the water bodies to be treated , where the watercraft comprises at least one reservoir, which comprises the feed material.
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