In recent years, our company has designed and developed a new generation of filter equipment -- positive pressure filter system, which is the result of our company's research and experiment on coolant treatment in grinding industry for many years. The equipment integrates positive pressure filtration, automatic slag discharge, pneumatic chip blowing, automatic chip brushing, backwash, cold treatment, liquid supply, liquid return, automatic fluid replenishment and other functions to provide coarse grinding, semi-fine grinding, fine grinding machine grinding fluid centralized filtration and cooling processing functions to ensure the supply of grinding fluid under different processes. The equipment adopts PLC automatic control, high degree of automation, simple operation. It provides an advanced, efficient and clean filtering mode for modern grinding enterprises. Instead of the one-time use of traditional filter paper, the equipment has the advantages of low cost and high filtration accuracy. By the centralized supply of liquid instead of the traditional machine filter one with one form, water treatment capacity, small area. The application of the equipment enables related enterprises to save economic benefits, but also in line with the national environmental protection requirements to save emissions.