Think Crucial Aqua-Tech EZ-Change Aquarium Filter Cartridge Replacement for Aqua-Tech 20-40 and 30-60 Power Filters， 4.50 x 6 x 6.75-Inch， 6-Piece</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>ODOR REDUCING Aqua-Tech EZ-Change #3 Aquarium Filter Cartridge Replacement that fits Aqua-Tech 20-40 & 30-60 Power Filters so you don't have to worry about the bad smells of an aquarium anymore!</li><li>EXPERT FILTRATION to remove odor， water discoloration， impurities， and any toxins that may hurt your aquarium!</li><li>EASY TO USE so you don't have to struggle to replace your filter every 2-4 weeks as experts recommend. It fits like a charm!</li><li>HEALTHIER AQUARIUM because this filters out anything unwanted or anything that may harm your aquarium and anything living in it!</li><li>GUARANTEED SATISFACTION because of a 30 day full money bank guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51J5asHcQqL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51bvU3SlLDL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41K3QqPCxVL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51lvn0sBfML.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51r4kQHh8RL.jpg' noproxy></br>