The candle filter is equipped with multiple filter elements in a closed container. The filter element is covered with a special filter cloth selected according to the characteristics of the material and liquid. When the liquid passes through the filter cloth, the solid matter in the liquid will gradually accumulate on the surface of the filter cloth. When these solid materials reach a certain thickness, a filter cake is formed.
Because the gap between the filter cake particles is very small, it prevents the escape of particulate impurities in the liquid, so that the filtrate becomes clear and the ideal filtering effect is achieved. When the filter cake exceeds a certain thickness, the rate at which the filtrate passes through the filter cake decreases, and the filtration efficiency becomes worse. At this time, it is necessary to remove the filter cake to complete a filtration cycle.