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Durable Natural Volcanic Rock for Water Treatment. High Purification Efficiency: Achieves over 85% COD and ammonia removal, plus 75-93% BOD removal. High Porosity Structure: Features 73-82% porosity and large specific surface area for biofilm growth. ISO9001 Certified Quality: Meets international quality standards with rigorous factory inspections. Versatile Water Treatment: Ideal for industrial wastewater, municipal sewage, and reclaimed water. Free Sample Testing: Free samples provided for performance testing before bulk orders. Customization Options: Supports full, minor, and flexible customization from samples or designs. Direct Manufacturer Sales: Factory direct pricing with no middlemen and stable raw material supply.