Feature This product consists of a diving pump and a biochemical filter. The pump body is made of molded engineering ABS plastic and can withstand shocks and rust. Made of stainless steel, the pump shaft can be used in both fresh and seawater. The motor is sealed inside the body using resin. With good water resistance performance and high insulation intensity, and with a heat protector, it is safe and reliable. Multifunctional design, with various purposes in one machine – pumping, oxygen addition, filtration, and UV sterilization 4 in 1 (SP-B and SP-C series do not include UV light). With a portable assembly structure, the filter can be easily set up with 1~2 filter cylinders, using special biochemical filter cotton. It is most suitable for cultivating fine nitrobacteria and cleaning water.