Fluid purification unit and fluid purification assembly including the same

A fluid purification assembly comprising:

• a first fluid purification unit including a case including a hollow and a plurality of openings communicating with the hollow to flow a fluid inside into the hollow and outside from the hollow, wherein the case includes first combining protrusions formed on a first face and first concave portions formed on a second face opposite to the first face, each of the first combining protrusions having a first cross sectional area and being regularly arranged in a first direction and at a first interval and each of the first concave portions having a second area corresponding to the first cross sectional area and being arranged at a second interval corresponding to the first interval;
• and
• a second fluid purification unit including second combining protrusions combined with the first concave portions, the second fluid purification unit having a structure substantially identical of that of the first fluid purification unit,
• wherein the first concave portions are defined by;
• a base corresponding to the second face;
• a first protrusion portion vertically extending along an edge portion of the base from the second face;
• second protrusion portions vertically protruding from a central portion of the base, the second protrusion portions being arranged at the second interval in the first direction;
• and
• extending portions extending toward the second protrusion portions from an inner sidewall of the first protrusion portion, the extending portions being arranged at the second interval in the second direction.