1) Distinguish the materials, materials and anti-corrosion properties of the main equipment: Distinguish the materials of sewage treatment equipment: glass fiber reinforced plastic, carbon steel, stainless steel

Determine the thickness of the equipment used: 4mm, 6mm, 8mm, 10mm, 12mm (glass fiber reinforced plastic)

Anti-corrosion (mainly carbon steel material anti-corrosion): use anti-embroidery paint or epoxy paint, internal and external brush or single-sided brush, brush several layers.

2) Know which equipment is equipped outside the main sewage treatment equipment, and the factory parameters of the equipment

In addition to the main body of the sewage treatment equipment, it contains the factory parameters such as pumps, fans, and electrical control devices for packing, whether there are other sewage equipment, equipment manufacturers or brands, etc.

3) Participate in the factory inspection to see the effect, and refer to the relevant successful cases. Investigate the strength of the manufacturer's supporting services.

4) Agree on the implementation standard of the effluent after treatment by the sewage treatment equipment to avoid disputes.

5) Compare, sign a contract and indicate the payment process before purchasing domestic sewage treatment equipment.

6) Select multiple suppliers for reference, and make a comprehensive comparison of their adopted processes, successful cases, prices and other factors. Agreed delivery, commissioning and payment procedures and signed a formal contract.