casing (4) for a water storage unit (1),with one floor,and a circular wall, one or more wall sections (6) with walls (5),where the floor and wall (5) are watertight and connect watertight and the housing (4) consists of a foldable material in such a way that it is movable between a space-saving, folded transport device and a larger, folded use device,and where the shell (4) is designed to incorporate in its folded arrangement a body supporting the shell (4)and where the casing contains retaining agents designed to hold the wall (5) on the scaffolding body (2) in the arrangement of use.
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