The present invention relates to a skimmer installed in a sea water aquarium to purify sea water. The skimmer comprises the following parts: a pump which has a water inlet and an air inlet formed at one end, and a first outlet raised and formed in the upper side so as to internally generate bubbles by the water and air supplied from the water inlet and air inlet and then discharge the bubbles into the first outlet； a first chamber which has a tubular shape and in which a fist bubble inlet, which is formed and penetrated into to allow the first outlet to be inserted, and a first cover having discharge ports for purified water are mounted on the bottom； a second chamber, which has a tubular shape and smaller diameter than the first chamber to be arranged inside the first chamber and in which a second cover having a number of through tubes for discharging water and bubbles from the inside, is mounted on the upper side and an entrance of the first bubble inlet is mounted on the upper surface of the first cover to be located in the circumference； a third cover, which is combined with the first chamber by being inserted into the upper end of the first chamber to be detached and in which a second bubble inlet is formed in the center, and the bottom surface upwardly invaginates in the direction of the second bubble inlet； a third chamber which has a tubular shape and the bottom is mounted on the upper surface of the third cover； a fourth chamber which has a tubular shape and smaller diameter than the third chamber to be arranged inside the third chamber and the bottom is mounted on the second bubble inlet in the third cover； and a fourth cover for the upper end of the third chamber to be opened and closed.본 발명은 해수 수족관에 설치되어 해수를 정화하는 스키머에 관한 것으로서, 일측에 물과 공기가 유입될 수 있도록 각각 형성되는 물 유입구 및 공기유입구와, 상측에 돌출형성되는 제1배출구를 포함하여, 물 유입구 및 공기유입구를 통해 유입되는 물과 공기에 의해 내부에서 버블을 생성한 후 제1배출구로 배출되도록 하는 펌프；와, 원형관의 형상으로 이루어지며, 펌프의 제1배출구가 끼워질 수 있도록 관통형성되는 제1버블유입구와 내부에서 정화된 물이 배출될 수 있도록 관통형성되는 정화수 배출구를
