Silica gel, also referred to as silica aerogel or hydrated silica, is listed by the FDA in the United States as
generally recognized as safe (GRAS), as anticaking agent, defoaming agent, stabilizer, adsorbent, carrier, conditioning
chillproofing agent, filter aid, emulsifying agent, viscosity control agent, and anti-settling agent.
Given the water adsorption properties of silica gel, it is used in domestic water filters. The surface structure of silica gel allows the adsorption of some minerals which are dissolved in the water