A filter element, comprising a filter element body having a cavity, a water inlet, a water outlet and an end cap, wherein the filter element further comprises a perforated partition within the filter element body, and the perforated partition is configured to divide the filter element body into at least two chambers, the at least two chambers include a first chamber and a second chamber, the first chamber is filled with an adsorption filter material, and the second chamber is filled with an ion exchange filter material; wherein the filter element further comprises at least two sealing ribs arranged on the inner surface at the lower end of the filter element body and a sealing gasket contained in the cavity at the bottom of the filter element body; wherein the sealing gasket includes at least two sealing grooves adapted to the sealing ribs; and wherein the filter element further comprises a base for fixing the filter element, and the base comprises a base body, a water outlet hole, a clamping rib, and a protrusion; wherein the base body is provided with the water outlet hole at the center of the base body and the base body is provided with clamping ribs circumferentially distributed on the surface of the base body, and the clamping ribs are adapted to clamp the lower end of the filter element body; the base body is provided with at least three protrusions on the surface of base body proximal to water outlet hole relative to the clamping rib, and the protrusions are configured to engage with the recesses of the sealing gasket, and characterized in that the sealing gasket is adapted to contact the base body to form a sealing assembly, wherein the sealing gasket includes a columnar part and at least three bosses arranged circumferentially on the end surface of the columnar part, the columnar part is provided with a central hole allowing water to pass through, a recess is provided between every two bosses, and the recess runs through diagonally or transversely between two adjacent bosses; the base body is provided with a water outlet hole at the center of the base body, and the base body is adapted to closely contact both the bosses and the recesses on the sealing gasket, or the base body is adapted to closely contact the end surface of the sealing gasket to achieve sealing between the sealing gasket and the base body. wherein the filter element further comprises at least two sealing ribs arranged on the inner surface at the lower end of the filter element body and a sealing gasket contained in the cavity at the bottom of the filter element body; wherein the sealing gasket includes at least two sealing grooves adapted to the sealing ribs; and wherein the filter element further comprises a base for fixing the filter element, and the base comprises a base body, a water outlet hole, a clamping rib, and a protrusion; wherein the base body is provided with the water outlet hole at the center of the base body and the base body is provided with clamping ribs circumferentially distributed on the surface of the base body, and the clamping ribs are adapted to clamp the lower end of the filter element body; the base body is provided with at least three protrusions on the surface of base body proximal to water outlet hole relative to the clamping rib, and the protrusions are configured to engage with the recesses of the sealing gasket, and characterized in that the sealing gasket is adapted to contact the base body to form a sealing assembly, wherein the sealing gasket includes a columnar part and at least three bosses arranged circumferentially on the end surface of the columnar part, the columnar part is provided with a central hole allowing water to pass through, a recess is provided between every two bosses, and the recess runs through diagonally or transversely between two adjacent bosses; the base body is provided with a water outlet hole at the center of the base body, and the base body is adapted to closely contact both the bosses and the recesses on the sealing gasket, or the base body is adapted to closely contact the end surface of the sealing gasket to achieve sealing between the sealing gasket and the base body.