The Hagen A1348 is an aquarium phosphate treatment that traps the following in aquarium water:
The Phosphate Remover 3.5 oz - Treats 27 Gal. - 3-pack helps keep your aquarium water crystal clear. This aquarium phosphate remover reduces odors, and makes aquarium maintenance easier for you. This Phos-X phosphate remover is suitable for use in fresh and saltwater aquariums.
The Hagen A1348 specifications: