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. The Tetra® Pond Bio-Active Pressure Filter helps keep pond water clear and healthy. Using both mechanical and biological filtration to help maintain clear and healthy pond water, this easy-to-use filter features unique, open-profile bio-activators to provide a large surface area to clean with maximum efficiency as pond water is forced through. After running through the cycle, the filtered water is returned to the pond by waterfall or stream. Once your pond is clean, the last thing on your mind is getting your hands dirty cleaning out the filter. That’s why we designed an easy backflush valve that can help you complete the cleaning process efficiently. You won’t even need to open up the filter; just remove the backflush cap and you’re good to go. Backflushing prevents dirt buildup so that all surface areas of the bio-activator media can remain active for biological activity. With its robust functionality, this filter works for ponds up to 2,500 gallons.