Filter and method for construction of a filter

Abstract

A large vault or tank receives the runoff water to be cleaned. There are one or more small tanks in the large tank (vault). Each small tank is inverted and receives water at its open lower end, from the large tank. The water entering the small tank rises, as the water level in the large tank rises, and flows upward through a filter. When the water level rises above the top of the filter it enters an outlet tube or pipe and then flows downwardly along the center-line of the filter. A float, a valve and a check valve may cause the system to function as a siphon and feed the filtered clean water to an outlet. Alternatively the siphoning effect will occur if the inside diameter of said outlet tube is small enough to form a partial vacuum.

1 . The method of making and using a system for filtering a liquid fluid comprising: providing a tube, said tube having an inlet, providing a layer of flexible filtering material, passing said material around said tube for at least 360 degrees to form a lap, and guiding the fluid to be filtered through said material and thereafter to said inlet so that the filtered liquid fluid is discharged through said tube. 
     
     
         2 . The method of making and using a filter as defined in  claim 1 , wherein said step of guiding the liquid fluid to be filtered through said material and thereafter through said tube in series comprises passing the fluid to be filtered upwardly, against the force of gravity, through said material and downwardly, with the force of gravity, through said tube. 
     
     
         3 . A filter for filtering a liquid fluid, comprising: a tube having an inlet, a layer of flexible filtering material, said layer forming a wound filter element in which the first lap of the wound filter element extends around said tube for at least 360 degrees, and a fluid guiding system for guiding the fluid to be filtered through said filtering material and thereafter to said inlet so that the filtered fluid is discharged through said tube. 
     
     
         4 . A filter for filtering a fluid as defined in  claim 3 , in which said fluid guiding system comprises an enclosure for guiding the fluid to be filtered through said filtering material and then to said inlet, said tube having an outlet at a lower level than said inlet so that fluid fed to said inlet flows out said outlet due to gravity.