Specification Item Guarantee value Organic matter 45-55% Alginic acid 10% Total Nitrogen 0.6% Phosphate (P2O5 ) 5.0% Potash (K2O) 20% Mg 0.04% S 1.0% Cu 0.0007% pH 9-10 Specific gravity 0.5g/cm3 Odder Seaweed-like Appearance Brownish Flake 25kg/bag;20kg/carton