Imagine Gold Llc AIM71256 Bio 3 Cart Penguin 125, 6-Pack Imagine Bio 3 Cart Penguin 125 6pk A new design in filter cartridges, the Imagine Bio 3 disposable filter cartridge is the perfect replacement cartridge for your Penguin Power Filter. This 3 stage cartridge provides mechanical, chemical and biological filtering in one easy to change packet. Imagine Bio 3 Cart Penguin 125 6pk A new design in filter cartridges, the Imagine Bio 3 disposable filter cartridge is the perfect replacement cartridge for your Penguin Power Filter This 3 stage cartridge provides mechanical, chemical and biological filtering in one easy to change packet A new design in filter cartridges, the Imagine Bio 3 disposable filter cartridge is the perfect replacement cartridge for your Penguin Power Filter This 3 stage cartridge provides mechanical, chemical and biological filtering in one easy to change packet