People who have used it say that the effect is really good. Fast blue stone is a mixture of black and white particles in proportion. Black particles are based on attapulgite and sepiolite, and other natural minerals such as diatomite and tourmaline are added, which has stronger adsorption than activated carbon. White particles are based on sepiolite and added with Meen marine purification factor, which can adsorb and decompose harmful substances such as formaldehyde and benzene.