Floatable swimming pool cover

Abstract: In one of its aspects, the invention provides a cover for a body of water, the cover comprising one or more tiles. Each tile comprises a generally flattened tile body floatable atop the body of water to cover a surface area thereof. The tile body defines an enclosure wherein at least a portion of the tile body that defines the enclosure is deformable. Each tile also comprises a ballast having a density greater than water and a port for conveying a fluid having a density less than water into and out of the enclosure. Upon conveying the fluid into the enclosure via the port, the portion of the tile body deformably expands to increase a volume of the enclosure and increase a buoyancy of the tile and, upon conveying the fluid out of the enclosure via the port, the portion of the tile body deformably contracts to decrease the volume of the enclosure and decrease the buoyancy of the tile.