Aqua-Tech EZ-Change Aquarium Filter Cartridge ( EZ #3 - 6 Pack )
Brand: AQUA-TECH
Color: Blue
EZ-Change number 3 Filter Cartridge fits AQUA-Tech 20-40 and 30-60 Power Filters
Contains AQUA-Tech Premium Activated Carbon
No messy assembly required
Changes in seconds just shake and rinse
For best results, change every 2-4 weeks