Check the listing for details. Zilla Replacement Filter Cartridges Medium, 3 Count ( Pack of 1). Color: Grey, Condition: New, Made in Vietnam. Listed at 15.00 USD. 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 filterEasy installation using the "FRONT" orientation tabFor optimal performance, change approximately every 4 weeksFor Zilla Internal Filter 20G and Small Basking Platform Filter 20G Zilla Replacement Filter Cartridges are dual-sided, featuring activated carbon and dense-floss that traps more fine debris. Medium and large replacement filter cartridges are for filters included with Zilla Deluxe Aquatic Turtle Kits. Also for use with Basking Platform Filters and Aquatic Reptile Internal Filters. Available in packs of 3. Replace cartridges every 4 weeks for best results. Zilla is committed to producing innovative products to build and maintain a healthy reptile habitat. From terrariums for your bearded dragon lizard to bark bedding for your frog, and floating turtle platforms, we provide what is necessary to get a terrarium or vivarium started. Essentials such as reptile food, humidity & temperature gauges, heat, light, accessories, and supplements are also available from Zilla products. We make it easy for you to get your first pet reptile, to grow in the hobby, and to become an enthusiast. For those seasoned reptile keepers, we are committed to innovation.