Great ponds start with TetraPond products We have everything you need to set up and maintain a beautiful pond including water pumps and filters pond accessories and décor lighting and equipment and fish nutrition and water care products TetraPond Replacement Pre-Filter Foam is a coarse foam cylinder designed to fit inside the Tetra Pond Water Garden Pump Pre-Filter TetraPond Pump Pre-Filter is designed to be attached to the intake of any Tetra water garden pump to reduce clogging Its unique design is easy to detach for cleaning Replacing the filter foam is quick and simple—just detach the lid from the pre-filter remove the old foam and put on the new and reattach the lid to the unit The black foam cylinder features a 1-inch diameter hole in the center and measures 6 inches long by 4 inches diameter Additional size available Since 1951 Tetra has developed the world's most comprehensive body of fish food knowledge and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home Whether you're an experienced hobbyist or just starting out Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor