Interpet internal power filters have triple action filtration for healthier aquariums, better aeration, fully adjustable, easy fitting, easy clean filter cartridge and patented aqua valve. The filter has two foams for mechanical and biological filtration, and a seperate carbon foam. It also comes complete with foam carrier, flow contol, head rotation, venturi and aqua valve. In addition they have a seperate Biomedia chamber. The huge surface area of this Biomedia provides superios filtration. Additionally it allows the filter foams to be cleaned more thoroughly, as doing so will not effect the biological effectiveness of the filter.2 Year Guarantee. For Interpet Fish Pod 120 or Pets at Home Fish Box 120 Aquarioums and all aquariums 82-136 Litres (18-30 Gallons).