Penn Plax Filter Cartridge for Smallworld Rectangle Tank Filter - 2 pk Under Gravel Filter Deep pore structure with interconnected

Deep pore structure with interconnected micro-tunnels offers vast surface area for billions of beneficial nitrifying bacteria to establish and thrive

nature's liquid bandage

Test on a small area before use on finished projects

For optimal filtration

Penn Plax Filter Cartridge for Smallworld Rectangle Tank Filter - 2 pk Under Gravel Filter Deep pore structure with interconnectedFilter Cartridge for Smallworld Rectangle Tank Filter 2 pk Good filters make clean water and healthy fish! Easily replace your filter cartridges with a Penn Plax Smallworld cartridge two pack. These easy to install cartridges remove gasses, odors and discoloration from your water, leaving it clearer and your fish in a healthier environment. The filter works best in a small, rectangular tank, but its appropriate for all tank shapes! The small filter