Formaldehyde is the number one indoor killer. Living in an environment with formaldehyde for a long time can lead to formaldehyde poisoning, causing difficulty breathing, persistent coughing, chest tightness, and shortness of breath. In severe cases, it can result in pulmonary and laryngeal edema and severe hypoxemia. The harm of formaldehyde to the human body is significant, as it can irritate the skin and mucous membranes, leading to allergic dermatitis, necrosis, and pigmentation spots upon direct contact. Inhaling formaldehyde can trigger bronchial asthma. Moreover, long-term exposure to formaldehyde can impair memory, and for pregnant women, it can cause fetal deformities and, in extreme cases, fetal death. To address the question of how to remove formaldehyde from indoor spaces, I consulted with Tianjin's formaldehyde removal experts. They informed me that regular ventilation can expel harmful gases to the outside, which is a simple and effective method. However, due to the long release cycle of formaldehyde, with a latency period of about three to ten years, ventilation alone is a temporary solution and not ideal. Currently, there is a plant-based essence purification method available, which extracts source bioagents from plants and uses a special formula to create a purification liquid that effectively eliminates formaldehyde. Activated carbon can also remove formaldehyde from indoor spaces, primarily through its adsorption capacity, which is related to the size of the carbon pores. The stronger the adsorption, the smaller the pores, and the greater the ability to absorb formaldehyde. It's important to note that after one month of use, the adsorption capacity of activated carbon gradually diminishes, necessitating timely replacement.