This is a Special Deal Triple Pack.You will receive:-Ammonia Pad-Nitrate Pad-Phosphate PadEach are 18 x 10 inches. Cut to fit media pads traps micro and macro organic particles, foreign debris, and excess fish food.For use in custom sumps/refugiums, hang-on filters, prefilter boxes, and more. Safe for both freshwater and marine aquaria.Chemical & Mechanical Dual stage filtration reduces ammonia spikes and toxic build up. Promotes a healthy aquatic environment. New thicker, more rigid design for extended use.