Water Absorbent Diatomite Tray ingredient : diatomite , quartz sand , plant fiber. Diatomaceous earth is a substance formed by plankton on the seabed or lake bottom after hundreds of years of deposition, It is rich in a variety of beneficial minerals. It's body has a porous molecular sieve structure with strong adsorption capacity,humidity control and air permeability. Suitable to be used as absorbent mats for soaps / cups / soap bottle / dish sponge / make-up bottles, and anywhere you need to absorb water quickly and keep the table / countertop surface dry. Maintenance: 1.Clean dirt and normal stain with clean water. 2.Clean stubborn stain with detergent. 3.Use sand paper to polish the surface when absorbent functionality deteriorates to regain the functionality.