... Seaweed Extract Flake, 100% water soluble, organic fertilizer 1.Black powder 2.Water soluble 3. Alginic Acid=8- ... 15% Natural Seaweed Extract Powder, 100% water soluble, organic fertilizer China patent no.: 03112663.6 Product ... pH=8-10Main ingredient: Alginic Acid: 8-15%, organic matter≥50%, N≥0.5%, P2O5≥3.0%, ... (As)N/D Natural Seaweed Extract Powder, 100% water soluble, organic fertilizer