Q1.Are you manufacturer? We are a factory and trading company integration, our factory is founded in 1985,specializesin manufacturing water treatment chemicals and providing technical service. Q2.How to get free samples? Small quantity sample is free, you could provide your DHL account for freight collector trans. fer express charge to us. For details, please request by email or message. Q3.What's your advantage? ★.Production capacity Top 3 in China. ★.More than 3000 tons production month ★.Send samples for free for you. ★.All products are harmless to body. .International well-known enterprises cooperation, Reply in 24 hours. We are factory,supplying OEM/ODM serivce.权.More than 10 engineers for product research and service. Q4.How to choose the suitable chemicals?Please send us some details such as the brand and model name or parameters that you areusing and inform us what kind of waste water that you treat and application that you want sothat we can choose a suitable model for you.If you don't know how to make test, we will give you more guidance online or you could sendus the waste water sample to test.Site test guidance also can be provided if necessary.