The filter is usually used as a pre-filtration device. It not only has the function of filtering, but also protects the subsequent equipment in the system. The water pump is an important component for the water inlet of the subsequent equipment, so the filter is generally installed in In front of the water pump. Pre-filters are generally used to filter substances with relatively large particle sizes such as suspended solids, sediment, colloids, and organic matter. In addition, there are some special filters, such as microporous membrane filters. The filter accuracy is usually below 1 micron. They are mainly used to remove impurities from bacteria in the water after passing through the ultraviolet sterilizer. This type of filter is usually used in water treatment. end.