Marina i110 Internal Filter - 100 liters (25 US gallons) All-In-One Filter Kits The internal thermostate acts as

The internal thermostate acts as a safty fearure and signals a built-in LED light indicating when the de-icer is in use

Fluval Stratum is the ideal substrate for stimulating the growth of aquatic plants in freshwater aquariums

and BioMax Biological Rings

Some ten years ago

Marina i110 Internal Filter - 100 liters (25 US gallons) All-In-One Filter Kits The internal thermostate acts asThe Marina i110 is a compact yet powerful internal filter for use with any goldfish or tropical tank up to 100 liters (25 US gallons). Complete 3 stage filtration (mechanical, chemical, biological) is provided thanks to its uniquely designed Power Cartridge (included). The outside of the power cartridge features polyester foam to trap fine particles; while the inside chambers contain carbon to remove pollutants and odors; and zeolite to eliminate