The Prizm Pro combines an efficient 18 blade turbo air/water injector together with Red Sea's patented convergent-divergent flow technology reaction chamber, resulting in exceptional skimming performance. The Prizm Pro is suitable for tanks up to 300 gallons. Flow regulator enables complete control of foam column, removable 40 oz waste collection cup. External water pump. Technologically advanced for the advanced hobbyist but simple enough to install for the beginner. Size:13"x 12"x 21".