The unique Prizm Pro reaction chamber consists of a convergent upward flow first stage, followed by a divergent downward flow second stage.The combined action of these 2 flows results in a great turbulence, extends the contact time between air bubbles and water, and creates a protein-loaded, stable foam that is pushed up to the throat of the skimmer. Suitable for marine & reef aquariums up to 300 gallons. Designed for sump and hang-on installations. Includes external water pump, removable 40 fl.oz waste cup with drain port, adjustable height surface skimmer, filtration media basket, user-friendly operation and set-up