Rush is a plant rich in dietary fiber. The central pith of the rush stem is composed of numerous white porous stellate cells, also known as spongy tissue. The whole stem is tough and elastic, has strong moisture absorption function and good ventilation performance, so it has the special function of absorbing harmful substances in the house, which is definitely good for the human body. However, when using it in areas with plum rains in the south or in relatively humid houses, you should pay attention to the following points: 1. Before using it every summer, gently wipe it with a semi-wet towel, then the sun is 90% dry, do not expose; 2. Because rush products have strong moisture absorption function, it may be wet when used in a relatively humid house. This is a normal reaction, as long as it is dried with a towel or treated with the sun. 3. Usually, it is only necessary to keep moderately dry and avoid direct sunlight. If you accidentally get a stain, wipe it with a dry cloth or rag with clear water and dry it. In case of mildew, it should be placed in the sun for about 1 hour, and then flapped with a brush or broom to remove the mold. 4. Before collection, it must be dried with a towel, or stored in a dry place after sun exposure, so as to facilitate normal use in the second year.