The liquid filter is a high-end sanitary filter housing, lightweight, suitable for small flow rates in medium and low-pressure environments. The design of the filter housing fully complies with sanitary and GMP requirements, and all processing uses sanitary fittings. The filter housing undergoes multiple production processes, with no dead ends, no leaks, easy to clean, and no residual liquid, meeting different user needs. It can be assembled into a two-stage, three-stage, or four-stage filter housing to achieve the best filtering effect. Internally, PP melt-blown, wire-wound, and various types of folded filter cartridges can be installed as filter elements to meet different process requirements. The product is widely used in pre-filtration and terminal precision filtration in industries such as biopharmaceuticals, food and beverage, purified water, and biotechnology.