Eliminates Reactive Phosphate from all Marine Fish & Reef Aquaria Overview 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-gal). 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.