FEATURE This product consists of a diving pump and a biochemical filter. The pump body is made of pressure-molded ABS engineering plastic, making it resistant to 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 waterproof performance and high-density insulation, and with a heat protector, it is safe and reliable. Multifunctional design, for various purposes in one pump, adding oxygen, filtration, and UV sterilization 4 in 1 (SP-B and SP-C series do not include UV light). With a portable, assembleable structure, the filter can be easily set up with 1~2 filter cylinders, using special biochemical filter cotton. It is most suitable for cultivating appropriate nitro bacteria and cleaning water.