Full spectrum chemical filtration pad loaded with three powerful medias for total filtration in reef, planted, fresh & saltwater aquariums, PURA Filtration Pad combines activities of pads such as Poly Filter, phosphate pads, ammonia pads, carbon, zeo-sorbent and filter floss into a single convenient and extremely well performing product, Maintains extremely low to non-measurable levels of phosphate and silicates thus greatly reducing propagation of algae, Removes copper, arsenic, zinc and other heavy metals, Fast removal of organics, metabolic wastes and residual medications, Extremely low impact on trace elements and desirable fertilizers like potassium, Outstanding mechanical filtration ability performs ultra fine water polishing, Dimensions: 15"" x 30"", SKU: RYLHC4466