Bi-directional filter

A fluid purification system comprising:

• a bi-directional filter comprising an outer housing and a filter assembly unit, the outer housing being provided with one inlet for contaminated fluid and at least one outlet for filtered fluid, wherein the filter assembly unit comprises at least one separation void for contaminated fluid, the filter assembly unit being connected to a drive unit through a shaft,
• wherein an outer dead end of the separation void is positioned concentrically around a periphery of the filter assembly unit and an inner dead end of the separation void is positioned concentrically around the shaft, and the outer dead end and the inner dead end are connected to the filter assembly unit via the at least one separation void forming compartments through which fluid passes within the bi-directional filter,
• wherein the filter assembly unit comprises a lower disc, an upper disc, and at least one filter, the lower disc and/or the upper disc comprising a magnetic material, and
• wherein a plurality of magnetic nanoparticles are introduced into the contaminated fluid upstream of the inlet of the bi-directional filter.