Case Studies

CEDI / MDI modules on a 5 CMH ultrapure water (UPW) skid

Semiconductor · UPW

Top-3 semiconductor equipment maker

Equipment is cleaned with ultrapure water before shipment and must comply fully with UPW specification. Ion concentration and particle counts are tightly regulated — among the most demanding applications a system can face.

Resistivity: ≥ 18.2 MΩ·cm
Particle: < 0.05 μm (50 nm)
Heavy metals: < 10 ppt
Application: Wafer cleaning

2Pass-RO + CEDI + RDICEDI with a semiconductor-grade mixed-bed polisher meets both the resistivity limit and the trace-impurity requirement.
High-purity PVDF / PFA pipingSemiconductor-grade piping throughout, with seamless fusion welding to prevent secondary contamination.
Passed strict verificationCleared every trace heavy-metal and particle test and was accepted on handover.

Ionpure CEDI stacks in a semiconductor ultrapure water system

Semiconductor · Trace Boron

Taiwan branch of a Belgian group

Water for advanced wafer cleaning and high-end semiconductor processing. Beyond resistivity, boron and heavy metals had to be driven down to ppt level — a specification a conventional DI system cannot reach.

Resistivity: ≥ 18.2 MΩ·cm
Boron: < 20 ppt
Heavy metals: < 5 ppt
Supply: 24 h continuous

2Pass-RO + VNX + RDICombined with semiconductor-grade resin and piping design to reach ultrapure water with metal ions below 5 ppt.
Trace boron controlBoron is among the hardest elements to remove; process configuration and resin selection held it under 20 ppt.
Uninterrupted 24-hour supplyContinuous production with redundancy, meeting round-the-clock line demand.

Pharmaceutical purified water plant room with storage tank, TOC-UV skid and CEDI module

Pharmaceutical · EU PIC/S

Pharmaceutical plant — EU PIC/S compliant

Serving drug compounding, injectable production and sterile cleaning water. The system had to be sanitisable end to end and satisfy EU PIC/S certification.

Capacity: 1 m³/h (1 CMH)
Resistivity: > 18 MΩ·cm
TOC: < 20 ppb
Bacteria: < 100 pcs/mL

85 °C hot-water sanitisation throughoutActivated carbon, HSRO and the 85 °C-rated CEDI module can all be thermally sanitised; measured bacteria counts held at 0 pcs/mL for three to six months.
SUS316L sanitary pipingSUS316L to BPE standard throughout, orbital welded so no dead leg remains in the line.
Complete DQ / IQ / OQ packageFull construction and validation documentation to PIC/S requirements.

BPE sanitary stainless piping for pharmaceutical ultrapure water

Pharmaceutical · Sanitary UPW

World-leading API maker — sanitary-grade UPW

A world-renowned manufacturer of active pharmaceutical ingredients, holding ISO and HACCP certification. A new plant called for a sanitary-grade ultrapure water system compliant with PIC/S — thermally sanitisable across every section, and meeting both water-quality and microbial limits.

Standard: PIC/S
Source water: Municipal mains
Piping standard: BPE
Sanitisation: Full-train thermal

Complete system from the mainsYeson delivered the whole chain from the incoming mains to the point of use, built throughout to PIC/S requirements.
BPE-compliant distributionDistribution piping laid out to BPE, leaving no dead legs so the loop can be fully cleaned and sanitised.
Automated welding, third-party verifiedStainless steel joined by automated orbital welding, with the welds passing independent third-party inspection.

Softening2-Pass R.O.CEDIAuto temp. control

RO and CEDI ultrapure water skid supplying a contact lens production line

Medical Devices

Top-5 contact lens manufacturer in Asia

Water for a contact lens production line, supplying pure water and ultrapure water in parallel to pharmaceutical-grade certification. Microbial count was the critical control point.

Pure water: 3 m³/h
Ultrapure water: 3 m³/h
Resistivity: ≥ 18.0 MΩ·cm
Recovery: 95–97%

RO + CEDI with RDI and final UFRO and CEDI produce the pure water; an RDI polisher and final ultrafiltration lift it to ultrapure grade.
Microbial counts held long-termAgainst a limit of 100 pcs/mL, measured counts stayed at 0–5 CFU/mL and held there for two to three months.
95–97% system recoveryRecovery across the whole system reaches 95–97%, cutting both discharge volume and water cost.

ROCEDIRDIFinal UF

Reverse osmosis skid supplying an LED manufacturing plant

LED · Optoelectronics

Global top-5 LED manufacturer

Feeding precision waterjet cutting and the ultrapure water pre-treatment system. The plant sits at the tail of the municipal network, where source quality swings widely and conductivity runs high — the central challenge of the project.

Capacity: 18 m³/h (18 CMH)
Conductivity: < 10 μS/cm
Source: Tail of mains
Application: Waterjet cutting

Two-stage pre-treatmentActivated carbon and softening resin remove suspended solids, organics and hardness ions, protecting the RO membranes.
Anti-fouling RO membranesDedicated anti-fouling elements markedly reduce blocking risk and cleaning frequency.
Stable output guaranteedOvercame severe local swings in mains quality to supply the line with stable, high-quality water around the clock.

Reverse osmosis skid at the Taiwan Water Corporation advanced treatment training park

Public Utility · Advanced Treatment

Taiwan Water Corporation — training park

Taiwan Water Corporation built a staff training park in Xinying, Tainan, covering conventional treatment, advanced treatment, and a practical field for piping and leak detection. It is Taiwan's first internationally oriented water treatment park — training the utility's own engineers and, under the national New Southbound Policy, water professionals from South-East Asian and allied countries.

Capacity: 276 CMD
Recovery: 70%
Feed turbidity: ≦ 1.0 NTU
Feed SDI: ≦ 3

Nine advanced treatment systems deliveredVacuum UF, pressurised UF, reverse osmosis, biological filtration, dissolved air flotation, ozone contact, pellet softening, biological activated carbon and wastewater neutralisation — nine systems, delivered under one scope.
A complete, continuous trainThe train runs end to end as a working plant, so it can be used directly for hands-on teaching and operator training.
Training and knowledge transferBeyond building the plant, Yeson provided operator training and shared its water treatment practice.

Spiral WoundPA TFC membrane8040 × 16FRP housing

Large-scale softening vessels producing 240 m³/h of soft water

Manufacturing · Textile Dyeing

Textile dyeing plant — high-volume softening

Process water for dyeing and finishing: 240 tonnes an hour of soft water below 5 ppm hardness as CaCO₃. The raw water is groundwater and must be filtered and softened before it reaches the process — and at this volume, energy consumption becomes a design constraint in its own right.

Capacity: 240 m³/h
Hardness (CaCO₃): < 5 ppm
Raw water: Groundwater
Operation: Fully automatic

Runs unattendedThe system is fully automatic — even regeneration salt needs no manual topping up — which markedly reduces the customer's labour and supervision cost.
Energy control at volumeOperating strategy tuned for high throughput, lowering energy per cubic metre while holding the specification.
Groundwater pre-treatmentMulti-media filtration with softening treats the groundwater and holds hardness reliably below 5 ppm.

MMFSofteningAuto regeneration

Two-pass RO and CEDI pure water system for automotive electronics

Automotive · EV Supply Chain

Automotive electronics / EV supply chain

Supplying high-temperature cleaning of critical components and continuous distribution along the line. Beyond resistivity, terminal water had to stay above 50 °C without a break in supply.

Capacity: 3 m³/h (3 CMH)
Resistivity: ≥ 18 MΩ·cm
Terminal temp.: > 50 °C
Supply: 24 h continuous

2Pass-RO + CEDI, no acid-alkaliElectrodeionization removes the need for chemical regeneration, making operation safer and maintenance cheaper.
SCR inline heating controlAn SCR inline heater with precision temperature control holds terminal water reliably above 50 °C.
24/7 high-reliability operationFully automatic control with redundancy and early warning delivers continuous production day and night.