Aqueon Specialty Filter Pads are designed to address common water issues. The pads are pre-cut to fit in the Aqueon QuietFlow LED PRO Power Filter Bio-Media Grid. There are three varieties available: Ammonia Reducing, Carbon, Phosphate Remover. Ammonia Reducing Pads help to remove excess harmful or toxic ammonia Carbon Pads remove pollutants and organic debris that discolor water, improving water clarity and reducing odor Phosphate Remover Pads help to remove excess phosphate that contribute to algae growth while trapping excess waste, food and other organic debris Pre-cut for easy installation For optimal performance, replace approximately every 2 to 3 weeks For Use with Aqueon:QuietFlow LED Pro Power Filter, Sizes 10 - 20 - 30 - 50 - 75 Size 10 : .75" x 2.78"Size 20/75 : .75" x 3.75"Size 30/50: .75" x 4" Customers also like these products: