Analysis starts at the source
We analyse the source water and how far it fluctuates, then design the system around it — rather than fitting a standard package to every project.
Home / About
About Yeson
Since 1981, Yeson has concentrated on a single discipline: treating water to the purity a process genuinely requires, and keeping that system running for years.
Company
Forty years of pure-water expertise
Yeson Water Treatment Co., Ltd. was established in Taipei in 1981 and has always focused on the complete planning, installation and operational management of pure-water treatment systems. More than forty years of accumulated technology and continuous innovation allow us to serve semiconductor, optoelectronics, pharmaceutical, hospital and general industrial customers with water solutions they can rely on.
Water treatment is never a single equipment purchase. It is a chain of linked judgements: how the source water fluctuates, where the real process limit lies, whether piping and welds will introduce secondary contamination, and what a shutdown costs the production line. Yeson's value is in carrying all of those judgements.
Milestones
From Taipei, across the strait
-
1981
Founded in Taipei, Taiwan
Yeson Water Treatment Co., Ltd. is established, beginning its specialist service in water treatment.
-
1996
Dongguan operation established
Expanding into southern China with a local engineering and after-sales service network.
-
1999
Fuzhou operation established
Completing the service footprint, giving customers in eastern and southern China responsive support.
-
2026
Tainan branch in preparation
A branch for southern Taiwan, bringing engineering and after-sales support closer to customers in the region. Scheduled to open by the end of 2026.
-
Today
Continuous innovation
Serving leading semiconductor, pharmaceutical and chemical manufacturers worldwide.
Taipei · Headquarters
Yeson Water Treatment Co., Ltd.
No. 11, Ln. 183, Zhongxing Rd., Xizhi Dist., New Taipei City 221, Taiwan
Tel +886-2-2692-7220
EngineeringFabricationService
Tainan · Branch
Closer to customers in southern Taiwan
In preparation, scheduled to open by the end of 2026, bringing engineering and after-sales service closer to customers in southern Taiwan.
Dongguan
Engineering & after-sales service
Established 1996, responsible for equipment delivery, installation and after-sales service across China, South-East Asia and Africa.
Fuzhou
Eastern & southern China support
Established 1999, providing responsive technical and spare-parts support to customers in eastern and southern China.
How we work
Systems built to run for years
Materials decide the outcome
Semiconductor-grade PVDF / PFA, pharmaceutical BPE SUS316L — piping and welding decide whether the specification is met at the point of use.
Verified with data
Online TOC, SiO₂, particle, dissolved-oxygen and resistivity monitoring — quality shown as data, not as a promise.
Long-term service
Handover is the beginning. Spares, consumables, scheduled maintenance and fault response stay with the same engineering team.
Work with us
It starts with a water analysis
Send us your source-water analysis, target specification and required capacity, and we will come back with a recommended treatment train.