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Strong Base Anion Exchange Resin 201X4. Comprehensive Certifications: Certified by WQA, NSF, SGS, TUV, and ISO for industrial safety. Free Sample Availability: 200g free sample provided; customer only pays courier fee. Custom Label Service: Customers can send bag designs for custom label production. 3-Year Warranty: Comprehensive 3-year warranty coverage for product quality assurance. Annual Production Capacity: Over 20,000 tons annual output of cation and anion exchange resins.