... waterproof and avoid water, solarization. Use: 1. Purifying agent in pharmaceutical industry, special in antibiotic medication, such as ... , Chloramphenicol, etc. 2. Precipitating agent in Rare-earth mineral processing. 3. Bleaching agent in the textile activities, wood pulp ... bleaching. 4. Rust-remover for Metal treatment. 5. Grinding agent, such as Marble polishing. 6. Waste water treatment, removing ...