Disclosed is a pool opening to be exposed and/or concealed based on low profile covers constituted by roof components juxtaposed in the direction of the length of the swimming pool and each comprising a cover in a translucent material and a rigid frame formed of two arches placed in transverse planes and braced by longitudinal crosspieces with two end crosspieces delimiting two longitudinal parallel edges to the roof component and which rest on the longitudinal edges of the pool of said swimming pool defining a support surface, the system comprising a storage area located at an end of said pool said storage area being sufficient to accommodate the ground surface of a roof component allowing said roof components to be stored in a stacked way, all of said storage area being horizontally displaced from said pool opening, a wheel configured to mobilize said roof components allowing said roof components to be displaced horizontally along the pool towards and/or away from said storage area, a lifter in the storage area, the lifter being configured to engage said roof components to vertically displace said roof components said storage area, to position one roof component over another roof component in a stacked position.