Generally, the space under the sink is packed with a variety of kitchen tools and utensils. This product considered how to use this space as a complexity space by changing its physical size. This product also removed inconvenient acts such as filter replacement thanks to the applied modular design concept and the designer considered more visual elements for recognize the time for filter replacement. This innovative design modified the shape to a square type by increasing the efficiency in the kitchen environment and established differentiated usability and an applied modular design concept to fulfill various consumer requirements.