Penn Plax Cascade Aquarium Filt-a-Packs</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Ready to use nylon filter bags for your canister filter</li><li>Offered in three varieties</li><li>Pro-Carb - Laboratory quality carbon</li><li>Pro-Z  - Ammonia removing zeolite crystals</li><li>Pro-Carb+Z laboratory quality carbon and zeolite crystals</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/51hGgBONAFL.jpg' noproxy></br>