600L, Needle wheel pump included1200L/hr; ?10cm, H47cm. The MACRO PROTEIN SKIMMER is a high performance skimmer. Designed with a patented needle-wheel impeller and an aspirating venturi, the skimmer produces largest quantity of micro-bubbles into the main chamber. While bubbles rise, these fine bubble surfaces can attach and collect most fine proteins and organic compounds and then slide into collection cup before the break down in the water. This process gives the most efficiently skimming and a better environment in the aquarium.