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Magnesium Sulfate Heptahydrate Mgso4 7H2O 4-7mm Agricultural Fertilizer. Agricultural Application: Essential for chlorophyll in crops like potatoes, tomatoes, and roses. Multi-Industry Use: Used in printing, dyeing, feed additives, and chemical industries. ISO and CIQ Certified: Meets international standards with CIQ and ISO certifications. Large Production Capacity: Annual output reaches 300,000 metric tons with 18 years experience. OEM Service Available: Customized bag designs welcome for OEM orders. Strict Quality Control: Samples tested every 2 hours; third-party inspections accepted. Fast Shipping: Shipping arranged within 20 days after order confirmation.