A personal water purification device consisting of a filtration unit, two pumping means and a pressurized circuit; where - the filtration unit is equipped with a filter and a sealing means that separates an inlet chamber for receiving water and an outlet chamber for a concentrate remaining after filtration; - two pumping means are situated within a concentrate cylinder: ∘ the first pumping means consists of a high pressure cylinder and a high pressure piston acting on a pressure chamber; ∘ the second pumping means consists of the said concentrate cylinder and a circulation piston which simultaneously acts on a return chamber and a water chamber situated within the said concentrate cylinder; ∘ where the first pumping means is situated within the water chamber of the second pumping means; ∘ where the circulation piston and the high pressure piston are coupled by a piston coupling means, both pistons (30, 41) are activated and moved synchronically with a piston rod; ∘ a water inlet is connected via a non-return valve to the pressure chamber of the first pumping means that allows the fluid to flow only to the pressure chamber; ∘ the pressure chamber of the first pumping means is connected via non-return valve to the water chamber of the second pumping means, where said non-return valve allows the fluid to flow only to the water chamber; and - the pressurized circuit, which maintains filter working pressure; characterized in that: - the pressurized circuit is formed between the second pumping means and the filtration unit in the way that water chamber is connected with the inlet chamber and the outlet chamber is connected to the return chamber; wherein - the piston rod stroke up intakes the waste water into the pressure chamber of the first pumping means; - the piston rod stroke down compresses the waste water situated in the pressure chamber by the high pressure piston, the compression starts from the atmospheric pressure to the pressure greater than the filter working pressure within the pressurized circuit, where said compression injects the waste water into the already pressurized circuit of the second pumping means; and where reciprocal motion of the circulation piston from the second pumping means produces fluid circulation through the pressurized circuit and the filter which produces the purified water on a permeate outlet of the filter. - the filtration unit is equipped with a filter and a sealing means that separates an inlet chamber for receiving water and an outlet chamber for a concentrate remaining after filtration; - two pumping means are situated within a concentrate cylinder: ∘ the first pumping means consists of a high pressure cylinder and a high pressure piston acting on a pressure chamber; ∘ the second pumping means consists of the said concentrate cylinder and a circulation piston which simultaneously acts on a return chamber and a water chamber situated within the said concentrate cylinder; ∘ where the first pumping means is situated within the water chamber of the second pumping means; ∘ where the circulation piston and the high pressure piston are coupled by a piston coupling means, both pistons (30, 41) are activated and moved synchronically with a piston rod; ∘ a water inlet is connected via a non-return valve to the pressure chamber of the first pumping means that allows the fluid to flow only to the pressure chamber; ∘ the pressure chamber of the first pumping means is connected via non-return valve to the water chamber of the second pumping means, where said non-return valve allows the fluid to flow only to the water chamber; and ∘ the first pumping means consists of a high pressure cylinder and a high pressure piston acting on a pressure chamber; ∘ the second pumping means consists of the said concentrate cylinder and a circulation piston which simultaneously acts on a return chamber and a water chamber situated within the said concentrate cylinder; ∘ where the first pumping means is situated within the water chamber of the second pumping means; ∘ where the circulation piston and the high pressure piston are coupled by a piston coupling means, both pistons (30, 41) are activated and moved synchronically with a piston rod; ∘ a water inlet is connected via a non-return valve to the pressure chamber of the first pumping means that allows the fluid to flow only to the pressure chamber; ∘ the pressure chamber of the first pumping means is connected via non-return valve to the water chamber of the second pumping means, where said non-return valve allows the fluid to flow only to the water chamber; and - the pressurized circuit, which maintains filter working pressure; - the pressurized circuit is formed between the second pumping means and the filtration unit in the way that water chamber is connected with the inlet chamber and the outlet chamber is connected to the return chamber; wherein - the piston rod stroke up intakes the waste water into the pressure chamber of the first pumping means; - the piston rod stroke down compresses the waste water situated in the pressure chamber by the high pressure piston, the compression starts from the atmospheric pressure to the pressure greater than the filter working pressure within the pressurized circuit, where said compression injects the waste water into the already pressurized circuit of the second pumping means; and