use: purifying agent in pharmaceutical industry, special in antibiotic medication, such as oxytetracycline , chloramphenicol , etc; precipitating agent in rare-earth mineral processing; bleaching agent in the textile activities, wood pulp bleaching; rust-remover for metal treatment; grinding agent, such as marble polishing; waste water treatment, removing calcium from water. packing: 25/50 kgs grey colour pp bag of top grade linerfilm,good properties of waterproof and avoid water,solarization;