Dual cylinder water well filter and method of using the same

A water well filter comprising:

• an inner pipe having an inner surface, an outer surface, a plurality of inner pipe slots, an inner pipe length, an upper end, and a lower end, the inner pipe comprising a polymer material, the inner pipe slots having a first cross-dimension;
• a permeable cover disposed on the outer surface of the inner pipe over the plurality of inner pipe slots, the permeable cover having openings with an opening cross-dimension;
• an outer pipe having an inner surface, an outer surface, a plurality of outer pipe slots, an outer pipe length less than the inner pipe length, an upper end, a lower end, the outer pipe comprising the polymer material, the outer pipe length being such that the outer pipe covers the plurality of inner pipe slots;
• a lower and upper seal connecting the outer pipe to the inner pipe to form a gap between the outer surface of the inner pipe and the inner surface of the outer pipe, the lower seal closing a lower end of the gap, the upper seal closing an upper end of the gap;
• and
• filter granules filling the gap, the filter granules having a granule cross-dimension that is less than the first cross-dimension but greater than the opening cross-dimension such that the filter granules cannot reach the plurality of inner pipe slots and enter the inner pipe.

A method for filtering out particulate matter from water in a well, the method comprising:

• passing the water through a first plurality of apertures in a first barrier;
• blocking an initial portion of the particulate matter with the first barrier;
• passing the water through filter granules having a granule cross-dimension;
• blocking a first intermediate portion of the particulate matter with filter granules;
• providing a second barrier having a second plurality of apertures with an aperture cross-dimension that is greater than the granule cross-dimension;
• disposing onto the second barrier a permeable cover having a plurality of openings with an opening cross-dimension that is less than the granule cross-dimension;
• passing the water through the plurality of openings in the permeable cover;
• blocking a second intermediate portion of the particulate matter with the permeable cover;
• blocking the filter granules from entering the second plurality of apertures in the second barrier with the permeable cover;
• passing the water through the second plurality of apertures in the second barrier;
• and
• blocking a final portion of the particulate matter with the second barrier.