Begins to eliminate reactive phosphate immediately upon addition to aquarium, Safe for all inhabitants of reef and marine fish-only aquaria, Each ml eliminates 1 ppm phosphate in 4 US-Gallons of water (250 ml treats 1,000 US-Gallons), Helps facilitate the removal of phosphate from aquaria during periods when dissolved organic material is abundant, May be used on an ongoing basis to help control phosphate in heavily-stocked aquaria, Over 50% stronger than most competing products, Formulated by a marine scientist, Liquid, 250-ml, SKU: RYLHC994