The system has a submerged pump (20) and a rising pipe (15), which is provided in a borehole (10). A water purification system for cleaning pumped water is arranged in the rising pipe and arranged above the submerged pump. The water purification system is provided with a blower (30) and a ventilation section (40). The water purification system comprises a water filter e.g. metal filter, mineral filter and/or multiple tube filter, which is arranged at an upper end of the borehole, where the water filter is back-rinsable.
