JBL PhosEx Rapid 250 mlPhosphate remover for freshwater aquariums. Key Features: For pond water to suit both fish and plants: reliably binds phosphate and thus prevents unwanted algae growth. For freshwater aquariums and turtle and shrimp tanks. Immediate action: liquid iron preparation to reduce high phosphate values. Removes phosphate. Prevents algae growth. Clears cloudy aquarium water. How it works: a liquid iron compound reliably and permanently binds the phosphate