For up to 100 litre aquariums the asap filters combine high performance and great usability features with a clever design that reduces the time required for maintenance work consists of a modern energy efficient motor placed in a stylish housing and a large transparent filter bowl filled with carefully chosen filtration sponge asap internal filters are also ideally suited for use in aquaterrariums since they can operate in shallow water as little as 5 centimetres deep they effectively oxygenate