The filter element separates solid particles in liquid or gas, or makes sufficient contact with different material components to accelerate the reaction time, which can protect the normal operation of the equipment or the clean air. When the fluid enters the filter element with a certain size filter, the impurities are blocked. And the cleaned stream flows out through the filter element. The liquid filter element allows the liquid (including oil, water, etc.) to clean the contaminated liquid to the state required for production and living, that is, to achieve a certain degree of cleanliness of the liquid.