Interpet Internal Power Aquarium Filter Interpet Internal Power Aquarium Filter – Simple and also highly effective internal aquarium filters. If you’re looking at this filtration system then you’re onto an absolute winner. The PF Filtration system is the most versatile, comprehensive and also easy-to-use filter range you can buy. The powerful venturi thoroughly aerate the water, and are easily controlled with a simple-to-use rocker switch. Comprising 5 units, to suit aquariums from 5-180 litres. Your water will stay clean and clear as the clever patented aqua value lets waste particles enter the filter. It then hangs onto them so they don’t repollute the water. Even better, you can turn off the filter and also remove the filter body for cleaning without the fear of seeing removed waste drop back into the aquarium. It’s simple to fit thanks to the easily located cradle. Also easily adjusted with a simple flow rate and direction adjustment feature.