Product information: Product name: favorable selenium-rich fertilizer Grade:0cm~1cm, 1cm~3cm, 3cm~5cm, 10~20mesh, 20~40mesh, 40~60mesh, 100mesh, 200mesh, 325mesh, 400mesh Application: selenium-rich particles for water treatment purification system. Chemical properties Seo2 0.02%~3% Sio2 60.00% Al2o3 15.20% Cao 4.20% Fe2o3 3.50% K2o 3.40% Co2 0.92% Mgo 2.20% P2o5 0.15% Tio2 0.50% Na2o 3.90% Mno 0.08% Selenium to human body: Selenium is ?known as "the king of anti-cancer trace elements of the human body. Selenium has strong biological activity, it is a good antioxidant, can eliminate organic body free radicals, adjust physiological balance. Have antitumor, anti aging, spot, radiation protection and enhancing immunity and other functions. Selenium deficiency is easy to cause the body to produce cardiovascular disease, liver disease, cancer and kashin-beck disease.