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It is often used as the second-level cleaning and washing equipment. It is composed of tower body, packing and tower internals. Tower internals include liquid distribution device, packing support device and fixing device, liquid collector and gas distributor, etc. Packing can choose polypropylene structured packing, Haier ring and saddle ring. At present, the packed tower made of glass fiber reinforced plastic has a large number of applications due to its good integrity, low investment, short production cycle, and excellent corrosion resistance.