Tetra EasyCrystal FilterBox 600 Internal Aquarium Filter

The Tetra EasyCrystal FilterBox 600 is an internal aquarium filter designed for freshwater aquariums with a capacity of 50 to 150 litres. The filter provides mechanical, biological, and chemical filtration to maintain crystal-clear water and a healthy aquatic environment for fish and plants.

The EasyCrystal system uses replaceable filter cartridges that combine filter floss for mechanical particle removal, activated carbon for chemical impurity absorption, and BioGrid biological media that supports beneficial bacteria colonies. The cartridge replacement system allows filter changes without getting hands wet, as the used cartridge is simply pulled out and a new one inserted. This design maintains the biological filter capacity because the BioGrid element remains in the filter permanently.

The filter includes an adjustable flow rate to suit different aquarium sizes and fish species preferences. The compact design attaches to the inside of the aquarium glass with suction cups, occupying minimal space. An integrated heater compartment in some versions accommodates a compatible Tetra heater for combined filtration and heating. The filter operates quietly for peaceful room placement. Replacement filter cartridges are widely available. Manufactured by Tetra, a leading brand in aquarium products and fish care.