ZLBGL series bag filter is mainly used in liquid secondary filter, with such features as higher filtering precision and processing load but lower cost and easy operation and maintenance. lt has metal net to support the filtering bag inside, with liquid to be filtered getting in from inlet. After filtered with filtering bag, impurities larger than the filtering hole diameter are intercepted onto the greater depth and inner surface of the filtering bag. Filtrate is collected at the outlet through filtering bag before being discharged. Choosing different filtering bags can reach different filtering precisions. Filtering bags can achieve faster replacement or are reused after flushing.