The EHEIM skim350 is a light, compact, surface skimmer with pump action. It's ready to use out of the box; with its intergrated pump there are no additonal installation pieces or kits necessary. Using the EHEIM skim350 leads to an increase in the oxygen content in the aquarium. Suitable for both freshwater and marine tanks. Compatible filter cartridge: 2616030 (UPC 720868261181).