Zilla Replacement Filter Cartridges Medium, 3 Count ( Pack of 1)

Medium and large replacement filter cartridges for filters included with Zilla Deluxe Aquatic Turtle Kits. Also for use with Basking Platform Filters and Aquatic Reptile Internal Filters., Installs in seconds: rinse first and align cartridge bottom key slot for an accurate fit inside the filter, Easy installation using the "FRONT" orientation tab, For optimal performance, change approximately every 4 weeks, For Zilla Internal Filter 20G and Small Basking Platform Filter 20G