Abstract: The present invention relates to a filtering apparatus (1) for the filtration of liquids, in particular water. It comprises, inside a container (11), a first chamber (50) intended to receive liquid to be filtered, a second chamber (54) intended to receive filtered liquid, a first porous wall (51) and a second porous wall (53) which delimit a filtration chamber (40) between them. The first porous wall (51) divides the first chamber (50) from the filtration chamber (40) and the second porous wall (53) divides the second chamber (54) from the filtration chamber (40), so that the filtration chamber (40) is interposed between the first chamber (50) and the second chamber (54). A granular filter material (4) is housed in the filtration chamber (40) and is enclosed between the first porous wall (51) and the second porous wall (53).

Abstract: The present invention relates to a filtering apparatus (1) for the filtration of liquids, in particular water. It comprises, inside a container (11), a first chamber (50) intended to receive liquid to be filtered, a second chamber (54) intended to receive filtered liquid, a first porous wall (51) and a second porous wall (53) which delimit a filtration chamber (40) between them. The first porous wall (51) divides the first chamber (50) from the filtration chamber (40) and the second porous wall (53) divides the second chamber (54) from the filtration chamber (40), so that the filtration chamber (40) is interposed between the first chamber (50) and the second chamber (54). A granular filter material (4) is housed in the filtration chamber (40) and is enclosed between the first porous wall (51) and the second porous wall (53).

Abstract: A natural filtering system for the treatment of swimming pool water and/or treatment processes in other applications involving the use of water (aqueducts, wells, drinking water purification plant, filtering plant for the collection of rain water, etc.), which can be installed inside compensation tanks in the case of swimming pools or in storage tanks or decantation tanks for other applications, and where the compensation tank (26) is filled with a filtering mass (14), comprising microparticles of high-efficiency quartz sand or similar or other material suitable for treating water, and where the mass is supported by at least one plate (15) extending over the entire surface of the compensation tank, and where the plate rests on at least one micromesh net made from high-density polyethylene, and where the water in the compensation tank (26) is purified by gravity-fed sprays (12) and by feeding stabilised and non-stabilised disinfectants (22) and pH correctors (23) into the compensation tank.