300 has 300 GPH capacity and fits tanks up to 100 gallons. 500 has 500 GPH capacity and fits tanks over 100 gallons. Filter maintenance is fast and easy. And the BIO-Wheel never needs replacing. The mini is also now available with BIO-Wheel filtration.
All models come with filter and rite-size filter cartridge.
5 Sizes from 100gph to 300gph. Simple, easy, three-stage Aquarium Filtration. Convenient Rite-Size Filter Cartrides. Automatic Self-Starting Feature. Worry-free, Safety Engineering.