Equipped with optimized impeller, achieving high and large-diameter water splashes and large amount of rotating water during operation, increasing aerobic capacity nearly by 30% at the same power. Equipped with stainless-steel submersible water-cooled motor (beautiful in appearance, water proof and corrosion resistant) and unique water fender, achieving excellent cooling effect. The super water-cooled motor is patented and can be protected with plastic protective cover (protect the gear box against corrosion).