Available in large size; measures 15-inch length by 30-inch by 1/2-inch thickness Groundbreaking filtration media at the right price. For Reef, Marine, Planted, and Fresh Water aquaria!The PURA family of filtration media is formulated to reduce scum formation in fresh and marine aquaria.All PURA products are formulated with Beta-GFH (Beta Ferric Oxide Hydroxide), the groundbreaking German made phosphate removing media that eliminates the primary nutrient of aquarium scum. PURA filtration products lead to a much cleaner and less labor-intensive aquarium, good for the animals, good for the hobbyist.Hydrated Beta-GFH is vastly superior to white colored Alumina based phosphate removers and greatly superior to numerous Alpha-Ferric Hydroxides sold in dry form.PURA PhosLock removes 45% more phosphates than Alumina media, and 20% more than Alpha-Ferric Hydroxides. Unlike Alumina, PhosLock never leaches phosphates back to the aquarium. Unlike competing Alpha-Ferric Hydroxides, PhosLock never disintegrates and never turns soft and muddy in aquarium water. PhosLock comes fully activated right out of the jar. PhosLock does not need a specialized reactor and can be easily confined and implemented in a fine meshed media bag.PURA Filtration PadFull Spectrum Chemical Filtration Massive Filtration Surface Area Removal of Phosphates, Organics, Toxins, Ammonia, Heavy Metals, Particulates Ideal for Reef, Plant, Fish, Marine, and Fresh SystemsPURA Filtration Pads offer all the filtration capabilities of PURA Complete in an easy to implement filter pad form. Technologically advanced and patented manufacturing technique allows for a inch thick pad impregnated with solid particles of media. This pad has a loose structure that resists premature clogging, contains thick and thin fibers to maximize fine filtration, contains a massive 5 ounces of media per square foot of pad, and has a debris trapping and indicating white overlay. This pad is ideal for wet/dry drip trays, power filters, canister filters, refugiums, and pond filters. Available in two generous sizes, P