1) the whole equipment of our company is made of stainless steel 304. Many small manufacturers will make hands and feet on the stainless steel link and use 201202 other materials in order to fill them up. It is impossible for us to make accurate judgments, including the thickness of the plate. Besides, the flocculation trough and metering tank behind the equipment include the bracket below. Many manufacturers use carbon steel materials. Our company is all made of stainless steel. 2) machining accuracy. All the rings and plates of our company are precision controlled by laser cutting. To prolong the service cycle of the equipment, the whole equipment of our company is guaranteed for one year. The service life of the moving ring is more than 4 years, and the service life of the spiral shaft is more than 6 years. It can be reflected in the contract. If the two vulnerable parts appear in this period, we all help to solve it.