Abstract:
A dual filtering system, especially for swimming pools, in which dirt and any large particulates are removed by passing a liquid feed through sand filter bed and minute impurities are then removed by passing the liquid filtrate through a multiplicity of vertically aligned, diatomaceous earth filter grid units. This permits the diatomaceous earth filter grid units to be operated for a protracted period of time with little, if any, need to backwash them. The filter grid units and the sand filter bed are disposed within a single tank in separate zones, one located above the other in a spaced, coaxial arrangement. The pressure differential between the two zones is automatically regulated during filtration by a check valve means. Each of the filter grid units is removably connected to radial arms of a manifold assembly and spaced apart from another. The grids are comprised of a rigid, sock-like pervious filter tube tightly fitted over a rigid, perforated tubular frame. This arrangement prevents adjacent grid units from tangling and losing effectiveness and also permits quick, easy removal and/or replacement of individual filter grid units.
Abstract:
A substantially weather-proof, protective cover which can be easily installed and removed and which is adapted to protect a swimming pool pump and filter assembly is provided. The cover is comprised of a plurality of separate pieces which when assembled and joined to each other form a unitary body which conforms substantially to the shape of the swimming pool pump and filter assembly. The cover includes: (1) a weather proof, outer layer, e.g., a marine vinyl layer which is sized to fit snugly around and substantially enclose the pump and filter assembly; (2) a mesh border affixed to the bottom edge of the outer layer; and (3) means located in the mesh border for securing the cover around the pump and filter assembly. The cover may also include: (4) sealable access means such as a zipper in the outer layer providing access to the pump and filter assembly.
Abstract:
A filtering system, especially for swimming pools, by which a liquid or gas may be cleansed of suspended particles by passing the liquid or gas, under a pressure differential, through a multiplicity of vertical, tubular filter grids, each of which holds an outer layer of a diatomaceous earth particles which transmits the fluid and captures the particles. Each time a filtering cycle is stopped, the diatomaceous earth particles fall from the grid units due to gravity and their interconnection in the coating layer. This prolongs the useful filtration time of the filter grid units before they need to be backwashed. The filter grid units are supported by a central manifold provided with a plurality of removable hollow arms which radially extend from a central hub, and have a plurality of threaded openings therein, spaced apart from one another along the length of the arms, for receiving respective mating threaded ends of the filter grid units and aligning them in a vertical array within the filter tank. Each of the grid units is comprised of a rigid, braided or woven sock-like pervious filter tube tightly fitted over a rigid, perforated tubular frame. This arrangement prevents the adjacent grid units from tangling and losing effectiveness and also permits quick, easy removal and/or replacement of individual filter grid units.
Abstract:
A step assembly for a swimming pool, includes a unitary, one-piece, molded plastic, stand alone, lower step section including two steps, an upper platform at least as high as an uppermost one of the steps, a first supporting structure for supporting the two steps and the upper platform on a ground surface as a stand alone unit without any further supporting structure, a first hollow chamber defined between the first supporting structure, the two steps and the upper platform, and a first opening in the first supporting structure permitting access to the first hollow chamber; a unitary, one-piece, molded plastic upper step section including an upper step at a height greater than the upper platform, a second supporting structure for supporting the upper step on the upper platform, a second hollow chamber defined between the second supporting structure and the upper step, and a second opening in the second supporting structure for permitting water access to the second hollow chamber, the upper step section having dimensions less than the first opening so as to be inserted through the first opening when disassembled from the lower step section and so as to be entirely removably positioned in the first hollow chamber in a disassembled position for storage and shipping; and a securing assembly which removably secures the upper step section on the upper platform of the lower step section in an assembled position.
Abstract:
A step assembly for a swimming pool, includes an upper step section including two upper steps at a first height, front, side and rear supporting walls for supporting the two upper steps on a ground surface, a hollow chamber defined between the supporting walls and the upper steps, and an opening in the rear wall for permitting access to the hollow chamber; a lower step section including two lower steps at a second height lower than the first height, front, side and rear supporting walls for supporting the two lower steps, and the lower step section having dimensions less than the opening so as to fit through the opening and be removably positioned in the hollow chamber; and a securing assembly which removably secures the upper step section with the lower step section, and including a tongue in the rear wall of the lower step section and a groove in the front wall of the upper step section which removably receives the tongue.