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Filter material for phosphate and silicate removal from marine and freshwater aquaria antiphos. Fe cut off the water phosphate and silicate, and thus counteracting unwanted algae growth. Antiphos is a highly active iron base and aluminum-free and absolutely harmless to plants and animals. Antiphos is also the ideal substrate for reducing phosphate levels in coral reef aquariums. The binding capacity of antiphos is approximately 10 g phosphate / kg. 500 ml are sufficient for a 300 l aquarium at normal load approximately 3-6 months.