The FiltoSmart Thermo line of external filters with integrated heaters are perfect for marine and freshwater aquariums. The FiltoSmart Thermo 300 has a compact design with a large filter surface. With the heater integrated into your filter, there is more room for undisrupted beauty in your aquarium. The water flow can easily be adjusted on both the inlet and outlet adapters for the filter. This filter, with its secure and steady base, can be conveniently hidden in an under-cabinet setup. Install the included diffuser and spray bar for uniform surface movement and additional dissolved oxygen for ideal water quality. Utilizing biological, mechanical, and chemical filtration, this external filter, ensures effective water filtration and optimal living conditions for aquarium inhabitants.