A pool cover support includes a base that rests on the bottom of a pool to be covered and a standard fixed to that base. A pole is adjustably and releasably connected to the standard and a plurality of bows are releasably attached to the pole. An S-shaped sleeve is releasably and adjustably attached to each rib and a flange is used to attach each sleeve to a side of the pool to be covered.

A pool cover has a compressible safety edge providing resilient conformance to obstructions over a wide range of atmospheric and loading conditions. Pool covers can be stretched over the water surface of a swimming pool, extending securely onto the surrounding apron except in the area of poolside obstructions. A safety edge may include a resilient compressible foam core supported and protected by a tough flexible fabric enclosure attached to the edge of the pool cover so as to be held against and conform to the obstruction to secure the opening. Solid or hollow foam cylinders of different shapes may be used and forms of extruded plastic elements are shown.

This pool cover utilizes multiple, laterally displaced air compartments which are fixed in location with respect to each other, and are integral portions of the cover. The air compartments may be interleaved by having laterally overlapping portions in order to minimize sagging which may result if any air compartment were to have an air leak. The cover can include a removable exterior portion which is exposed, and an interior portion containing the air compartments which are in contact with the pool surface. This allows easy removal of the top portion of the cover for cleaning and for examining individual air compartments.

An anti-litter float or balloon for a swimming pool. The single compartment balloon abuts continuously the containing wall, and the self-mooring balloon prevents litter from being disbursed into the pool water. Flaps and/or element-resistant covers can be used with the self-mooring single compartment balloon to batten down the swimming pool. The self-mooring single compartment float is sloped from the apex of its vertex downward toward the swimming pool's lip.

Disclosed is a fluid reservoir having a bottom and side and end walls which is lined with a flexible material secured about its marginal edges to a footing surrounding the reservoir. A cover is disposed over the reservoir with its marginal edges secured to the footing. A fan supplies air under pressure into the space between the cover and the fluid level to maintain the cover in a raised state above the fluid surface. Webs are provided along the outside of the cover to shape the cover under pressure and to relieve the stresses along the fastening elements used to connect the cover and the footing. The fan operates to supply air under pressure upon sensing a predetermined low pressure in the system, whereas a pressure relief valve opens to vent the air under pressure upon sensing a pressure higher than a predetermined pressure.