FEATURES: 1. Biochemical cotton nitrifier to improve water quality. 2. Anti-friction, alumina porcelain axie; rustless,suitable for salt and fresh water. 3. Permanent magnetic synchronous machine; efficient energy consumption. 4. Internal excess current and overheating protection. 5. ABS plastic coated body, durable construction, non-corroding. 6. Multiple application-able to pump and filter water, spray oxyen. USE: To pump and filter water and to spray oxygen for all kinds of aquariums.