Eheim Skim marine 300 is a compact, very powerful protein skimmer for marine water aqauriums up to 300 l water volume. The Eheim skim marine 300 may be small but it delivers the same results as a large protein skimmer. The skimmer is powered by a highly efficient needle wheel pump (impeller) and has an adjustable air intake which sucks in air independently and de-termines the skim rate. It is easy to attach the skimmer to the aquarium glass using the magnetic holder or it can be installed in a filter sump if preferred.Eheim Skim marine 300+ protein skimmer for sea water aqauriums up to 300 l+ Skimming pump with highly efficient needle wheel technology+ independent air intake (dispergator principle)+ adjustable air intake+ extremely quiet+ low energy consumption+ high skim performance+ can be fixed in the aquarium or in the filter sump+ easy installation with magnetic holder+ can be completely disassembled for cleaning+ compact design+ dimensions: 153x348x91 mm+ high quality with 3 yea