Type SF are vertical froth pumps designed to increase the pumpability of frothy slurry, to minimize the entrainment of air in the slurry, and to maximize venting of air in the sump, suction and pump. The principle of operation is similar to that of hydrocyclone separation. Froth pumps, also known as foam pumps, are a kind of vertical tank slurry pumps. They are used for flotation process where froth is innevitable. The material of froth pump wet end parts is also the long known A05, but for the tank, we can coat the steel tank with natural rubber based on your special requirement.