FEATURE This product consists of the diving pump and biochemical filter. The pump body is made from diecast ABS engineering plastic and can endure shock and rust. Made of stainless steel, the pump shaft can be used in freshwater and seawater. The motor is sealed in the body with resin. With good waterproof performance and high isolation intensity, with the protector for heat, it is safe and reliable. Multifunctional design, various purposes in a machine-pumping, adding oxygen, filtering and UV sterilizing4in 1 (SP-B SP-C series do not include UV light). With a portable assembly structure, the filer can be easily set with 1~2 filter cylinders. adopting special biochemical filter cotton.It is most suitable for cultivating fine nitrobacteria and cleaning the water.