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A water purifying cartridge, attached to an empty polyethylene terephthalate or PET bottle integrally formed with a seat member, including: a flange member having substantially the same diameter as an outer shape of a spout of the bottle and a thickness portion screwed to water-tightly fit an inner

A water purifying cartridge, attached to an empty polyethylene terephthalate or PET bottle integrally formed with a seat member, including: a flange member having substantially the same diameter as an outer shape of a spout of the bottle and a thickness portion screwed to water-tightly fit an inner portion of a screw cap of the bottle; a water charging/discharging mouth portion opened to a substantially central portion of the flange member; a hollow neck portion inserted inside of the spout of the bottle adjacent to the flange member and having projected portions; a filter portion under the neck portion; an extractable/contractable adjusting portion adjacent to the filter portion; a cylindrical portion adjacent to the adjusting portion; and a water purifying portion having an outer periphery with clearances for passing water therethrough. The adjusting portion, the cylindrical portion and the water purifying portion all containing water purifying agents.

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1. A water purifying cartridge for an empty polyethylene terephthalate or PET bottle comprising: a flange member having a diameter substantially the same as an outer shape of a spout of the empty polyethylene terephthalate or PET bottle, the flange member having a thickness portion screwed to fit

1. A water purifying cartridge for an empty polyethylene terephthalate or PET bottle comprising: a flange member having a diameter substantially the same as an outer shape of a spout of the empty polyethylene terephthalate or PET bottle, the flange member having a thickness portion screwed to fit, in a water-tight manner, to an inner portion of a screw cap, when the screw cap, inherently provided to the empty polyethylene terephthalate or PET bottle, is fitted to a thread portion of the empty polyethylene terephthalate or PET bottle; a water charging and discharging mouth portion opened to a substantially central portion of the flange member; a hollow neck portion inserted to an inside of the spout of the empty polyethylene terephthalate or PET bottle successive to the flange member, the hollow neck portion having projected portions in a shape of a cross or a shape of a line brought into close contact with an inner diameter of the spout of the empty polyethylene terephthalate or PET bottle by a predetermined length; a filter portion arranged right under the hollow neck portion; an extractable and contractable adjusting portion filled with at least a first water purifying agent successive to the filter portion; a cylindrical portion filled with at least a second water purifying agent successive to the extractable and contractable adjusting portion; and a water purifying portion which is filled with at least a third water purifying agent, the water purifying portion having an outer periphery provided with meshes or clearances for passing water therethrough. 2. The water purifying cartridge for the empty polyethylene terephthalate or PET bottle according to claim 1: wherein the water purifying cartridge for the empty polyethylene terephthalate or PET bottle is attached to the empty polyethylene terephthalate or PET bottle by providing a packing member which is fitted, in a water-tight manner, to an inner diameter portion of the spout of the empty polyethylene terephthalate or PET bottle substantially in the same shape, the packing member having an inner portion which is fitted with a main body of the water purifying cartridge to the spout of the empty polyethylene terephthalate or PET bottle. 3. The water purifying cartridge for the empty polyethylene terephthalate or PET bottle according to claim 1: wherein the extractable and contractable adjusting portion and the water purifying portion are each removable and the first and third water purifying agents, filled to inner portions of the extractable and contractable adjusting portion and the water purifying portion, respectively, are formed exchangeably. 4. The water purifying cartridge for an empty polyethylene terephthalate or PET bottle according to claim 3: wherein a lower portion of the water purifying portion is formed by a removable lid structure for exchanging the third water purifying agent filled therein. 5. The water purifying cartridge for an empty polyethylene terephthalate or PET bottle according to claim 1: wherein the extractable and contractable adjusting portion, the cylindrical portion, and the water purifying portion are all constituted exchangeably in a state so as to be filled with the first, second, and third water purifying agents, respectively.