“Total nitrogen clearly includes ammonia nitrogen, so how can the test result for ammonia nitrogen be higher instead?”“The sum of ammonia nitrogen and nitrate nitrogen exceeds total nitrogen—clients will never accept this report!”In wa···

​Since its establishment, VVNA has taken "Safeguarding Water Quality Safety" as its core mission, deeply engaging in the field of water quality research and detection. Through continuous technological investment and practical accumulation,···

​In China, water treatment plants adopting the chloramine disinfection process are commonly confronted with a thorny challenge: excessive ammonia dosing leads to an abnormally low chlorine-to-ammonia ratio. Though seemingly a simple issue,···

Founded in 2019, VVNA is a subsidiary of VVNA Water Quality Analysis Instruments (Shenzhen) Co., Ltd., with its headquarters located in Shenzhen. We are a technology-driven enterprise integrated with the R&D, production, sales, and after-sa···