Henan addison environmental technology co. Ltd. Is a professional producer of a variety of sewage treatment agents, including polymeric aluminium, polypropylenemide, sewage ph regulation agents, sewage nitrogen removal agents and sewage treatment agents. The company offers a variety of sewage purification programmes, free samples, free water sample testing, sewage drug testing, etc., and one-on-one services, and you are welcome to consult and buy。