The top of CSCH series filter housing adopts one-piece casting structure, horizontal inlet and outlet, internal thread at both ends, and the end cap can be fixed directly to the pipeline, so that the replacement of filter cartridge only needs to disassemble the housing, without disassembling the pipeline, which is more convenient and practical. Sanitary filter housing, fine polishing, and the surface option Ra＜0.6μm, and electro-polishing is optional. The filter housing can be adapted to the filter cartridge of 222 and DOE, so that a variety of filter cartridges can be selected for customers, which is suitable for precision filtration requirements of various types of chemicals.