A liquid purification device operating under the force of gravity comprising: a lid provided with inlet holes for source liquid; a body frame with a vertical axis that includes an upper filtering zone and a lower filtering zone with filter medium therein; a means for changing the direction of feed liquid flow located inside the device and containing the filter medium, the means for changing the direction of feed liquid flow is simultaneously the lower filtering zone and is formed by a chamber of variable shape and size with the filter medium and with inlet holes located in an upper or upper and lower parts of a side wall of said chamber; a vertically oriented inner annular space that is in liquid communication with the chamber through said inlet holes and formed by an inner side wall of the body frame and an outer side wall of the chamber and tapers to the lower part of the body frame, said annular space containing sorption filter material and is designed to pass feed liquid from the upper filtering zone into the chamber through the inlet holes in radial direction; an air vent means to remove air from the lower filtering zone made of a base and a vertical part, the base of said air vent means is connected to the upper part of the chamber of the means for changing the direction of feed liquid flow and has an air vent element located in an upper wall of said air vent means; the liquid purification device being configured for air removal from the lower filtering zone by an upward feed liquid flow at the beginning of a filtration process during filling said device with feed liquid, characterized in that the liquid purification device comprises a hollow fiber element and the sorption filter material arranged inside the chamber of the means for changing the direction of feed liquid flow. a lid provided with inlet holes for source liquid; a body frame with a vertical axis that includes an upper filtering zone and a lower filtering zone with filter medium therein; a means for changing the direction of feed liquid flow located inside the device and containing the filter medium, the means for changing the direction of feed liquid flow is simultaneously the lower filtering zone and is formed by a chamber of variable shape and size with the filter medium and with inlet holes located in an upper or upper and lower parts of a side wall of said chamber; a vertically oriented inner annular space that is in liquid communication with the chamber through said inlet holes and formed by an inner side wall of the body frame and an outer side wall of the chamber and tapers to the lower part of the body frame, said annular space containing sorption filter material and is designed to pass feed liquid from the upper filtering zone into the chamber through the inlet holes in radial direction; an air vent means to remove air from the lower filtering zone made of a base and a vertical part, the base of said air vent means is connected to the upper part of the chamber of the means for changing the direction of feed liquid flow and has an air vent element located in an upper wall of said air vent means; the liquid purification device being configured for air removal from the lower filtering zone by an upward feed liquid flow at the beginning of a filtration process during filling said device with feed liquid, characterized in that the liquid purification device comprises a hollow fiber element and the sorption filter material arranged inside the chamber of the means for changing the direction of feed liquid flow.