perfected filter, characterized by being composed of two preferably metal lids (10) whose outer perimeters arise respective folds (11) shaped tab emerging perpendicular to the horizontal planes (10), its purpose being to position the cylindrical guard (12) provided on its surface a series of holes (13) uniformly distributed, having a certain distance from the sheet (12) other perforated sheet (16) similar to (12), which together with the perforated sheet (14) located at (16) a space center position delimit together, because it is occupied by clay and activated carbon, while in the delimited (16) and (12) space is occupied by an arranged filter paper in zigzag is secured to the caps by the existence of a conventional adhesive, covers (10) having a small recess to facilitate positioning of the three lam INAS drilled.
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