The little masking killer. In almost every aquarium, a film of microorganisms, dust, oils and feed fats forms on the surface of the water over time - the film of film. With the EHEIM skim350 surface suction device you can reliably remove this film and thus achieve a crystal-clear water surface and a higher oxygen content. The Eheim skim350, designed for continuous operation, is also suitable for short-term use. If used alternately in several aquariums, please ensure that no algae spores or diseases are transmitted. The sucked in bacteria and dirt particles collect in the filter sponge. This is simply removed after use and thoroughly cleaned.