A liquid dispenser, comprising: a tank having a bottom, the bottom including a protrusion projecting upward; and an inner assembly having a pump and a bottom provided over the protrusion of the tank, the inner assembly being removable from the tank, wherein the inner assembly further includes: a first filter, a second filter located inside the first filter, a support including an upper plate and a sidewall, the sidewall connected to a lower side of the first filter, and a lower filter cover provided at a lower end of the first filter, the lower filter cover comprising: a frame inserted into the support and inserted onto the protrusion when the inner assembly is coupled to the tank, and a flange extending in a horizontal direction from a lower end of the frame and provided under lower ends of the first filter and the support, wherein, when the inner assembly is coupled to the tank, the upper plate and the sidewall of the support cover a top surface and side supports, respectively, of the protrusion, wherein the second filter has a tubular outer wall extending perpendicular to the bottom plate and an inner wall provided inside the outer wall, and wherein the pump is provided inside the second filter. a tank having a bottom, the bottom including a protrusion projecting upward; and an inner assembly having a pump and a bottom provided over the protrusion of the tank, the inner assembly being removable from the tank, wherein the inner assembly further includes: a first filter, a second filter located inside the first filter, a support including an upper plate and a sidewall, the sidewall connected to a lower side of the first filter, and a lower filter cover provided at a lower end of the first filter, the lower filter cover comprising: a frame inserted into the support and inserted onto the protrusion when the inner assembly is coupled to the tank, and a flange extending in a horizontal direction from a lower end of the frame and provided under lower ends of the first filter and the support, wherein, when the inner assembly is coupled to the tank, the upper plate and the sidewall of the support cover a top surface and side supports, respectively, of the protrusion, wherein the second filter has a tubular outer wall extending perpendicular to the bottom plate and an inner wall provided inside the outer wall, and wherein the pump is provided inside the second filter. a first filter, a second filter located inside the first filter, a support including an upper plate and a sidewall, the sidewall connected to a lower side of the first filter, and a lower filter cover provided at a lower end of the first filter, the lower filter cover comprising: a frame inserted into the support and inserted onto the protrusion when the inner assembly is coupled to the tank, and a flange extending in a horizontal direction from a lower end of the frame and provided under lower ends of the first filter and the support, a frame inserted into the support and inserted onto the protrusion when the inner assembly is coupled to the tank, and a flange extending in a horizontal direction from a lower end of the frame and provided under lower ends of the first filter and the support, wherein, when the inner assembly is coupled to the tank, the upper plate and the sidewall of the support cover a top surface and side supports, respectively, of the protrusion, wherein the second filter has a tubular outer wall extending perpendicular to the bottom plate and an inner wall provided inside the outer wall, and wherein the pump is provided inside the second filter.