For 50 year, fishkeeping enthusiasts have looked to the Tetra name 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. Keep your water crystal clear for healthier fish with these ready to use carbon filters. This pack of large carbon filters fit Whisper EX30, EX45 and EX710 filters. Finally a Carbon Filter as innovative as the Whisper EX Filtration System it's designed to fit. Tetra Carbon Filters' layers of multi-density floss effectively trap even the smallest particulates while activated carbon rapidly eliminates odor, discoloration, impurities, and toxins. The coarse layer removes larger particulates, the activated carbon rapidly removes odor, discoloration, impurities and toxins, while the multi-density layer captures a full range of particulates. The result is water that's clear, healthy, and polished.