A device for purifying a fluid is disclosed. The aforesaid device comprises: (a) a passage adapted for conducting a flow of the fluid, said passage provided with input and output openings (b) a plurality of elongate members coated with a titanium oxide disposed within the passage (c) fastening means for mechanically fixating terminals of the elongate members within the passage (d) at least one source of ultraviolet radiation adapted for illuminating the elongate members (e) pumping means adapted for generating the fluid flow through the passage from the input opening to the output opening. The fastening means comprises at least two fasteners. Each fastener comprises two mutually orthogonal spaced apart pluralities of parallel rods. The rods are adapted for restricting lateral displacement of the elongate members.
