Underworld Polyfilter is a unique, specially patented filter medium for chemically filtering and purifying both fresh and saltwater aquaria. Underworld Polyfilter will remove excess nutrients, toxins and unwanted pollutants and is also ideal for copper removal from marine tanks. Underworld Polyfilter will safely remove Ammonia/Ammonium, Nitrites/Nitrate, Copper/Copper Formalin/Chelated Copper, Phosphates, Antibiotics, Amino Acids, Dyes, Proteins, Toxic Metals, Phenols and insecticides. Underworld Polyfilter can be cut to fit any type and size of filter.
