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1000 Kgs 70% Sodium Hydrosulphide Yellow Flakes with High Quality for Sewage Treatment. High Purity Grade: Industrial grade with 70% purity content available. Flexible Packaging: Available in 25kg, 50kg, 900kg, and 1000kg bags. Comprehensive Certifications: Certified by CCIC, CIQ, ISO, and RoHS standards. Sample Availability: Free samples available; buyer only pays courier cost. Quality Assurance: Each batch includes COA; replacement or refund for quality issues. Global Shipping: Export from Tianjin, Qingdao, and Xinjiang ports. Customization Options: Full customization, minor customization, and flexible options available.