The SunSun CBG-500 hang-on filter is ideal for small aquariums as it is installed outside the aquarium. The filter is hung on the side or rear aquarium wall, while the pump is mounted inside the aquarium. An adjustable spacer enables correct positioning. The aquarium hang-on filter can be used in aquariums with a water volume of 38 to 115 litres. Its pump capacity is 500 litres per hour. The water flow is infinitely variable and can therefore be adapted to the size of the aquarium. The water is first freed of floating particles by means of a surface skimmer. The SunSun CBG-500 hanging filter with integrated UV-C unit offers mechanical and biological cleaning in one. The suspended filter is already fully equipped with filter fleece, filter sponge, activated carbon and bioballs. Filter wadding can be used to remove coarse dirt particles, sponges reduce nitrate, clean the water of chemical impurities and provide optimum conditions for the colonisation of filter bacteria. Activated carbon is used in aquariums to bind urine and humic substances, pesticides, metabolic products and similar residues, thus ensuring clear aquarium water. Bioballs provide bacteria with a large surface area to colonise and are considered high-performance fillers, especially in large filter systems. The highlight of the CBG-500 is the integrated UVC unit: The aquarium water is first led past the UVC clarifier unit. The UVC radiation from the UV lamp (output: 5 W) kills harmful algae, bacteria and germs and keeps algae formation under control.