Process guide in Chinese · English
More treatment stages do not automatically make a system better suited to your factory. Start with the source water, required water quality at the point of use, daily consumption and peak demand. Then review the treatment route together with storage, distribution and installation conditions.
What changes between the three treatment routes?
Single-pass RO
Route: pretreatment → one RO pass.
RO membrane separation reduces dissolved salts and substances the membrane can retain. A single-pass route can be evaluated against the source water and production-water requirement; the equipment name alone does not establish the final water quality.
Two-pass RO
Route: pretreatment → first RO pass → second RO pass.
The second pass treats water from the first pass to further reduce dissolved salts. Review the complete design against the required output and water specification, rather than adding the capacities of the two passes.
RO + EDI
Route: pretreatment → RO → EDI, subject to feedwater requirements.
EDI is used to further remove ions after suitable RO-treated water. It does not replace raw-water pretreatment or the RO system. Higher-purity applications also require review of storage, circulation, distribution, terminal treatment and monitoring.
Three project records show different selection starting points
Aluminium processing in Senegal: single-pass RO
This project used local municipal mains water and a 2 m³/h single-pass RO system with pretreatment. The recorded source-water conductivity was 650 μS/cm; product-water conductivity below 50 μS/cm was the customer’s requirement. That requirement is not a reported commissioning measurement or a guarantee for another factory.
The customer installed the system with guidance from Qingze. Read the aluminium-processing project and view actual equipment photos →
Beverage production in Senegal: two-pass RO
The first pass produced 9 m³/h and fed the second pass, which produced 6 m³/h. These are stages in series: the figures are not added to claim 15 m³/h of final water.
A separate concentrate-recovery unit was later added after the customer reported insufficient well-water supply. Recovered permeate returned to the raw-water tank and passed through the main treatment route again. It was not sent directly to beverage production, and recovery is not automatically included in a two-pass RO system.
Read the beverage project and concentrate-recovery arrangement →
Production water in Hubei: two-pass RO + EDI
The Hubei project combined two-pass RO, EDI, storage and transfer for a high-purity production-water requirement. The recorded 18.2 MΩ·cm figure is a project water-quality target, not a universal EDI guarantee or a published acceptance-test measurement.
Review the Hubei system, actual equipment and delivery scope →
Questions to resolve before choosing a route
Is a TDS or conductivity reading enough?
A single reading does not describe all the conditions relevant to treatment selection. Send the available water-analysis report with the sample location, date and units, together with the water specification required by your production process. Keep source-water results separate from final-water requirements.
Will an extra RO pass solve recurring membrane blockage?
Do not select an additional pass solely from that symptom. Describe the existing treatment route, pretreatment operation, output, cleaning history and observed problems. The aluminium-project review considered precipitation risks, possible microbiological fouling and pretreatment maintenance; conductivity alone did not prove a cause.
Does the treatment route define the whole supply scope?
No. Confirm the pretreatment, RO equipment, EDI where required, pumps, tanks, distribution, controls, site connections and installation responsibilities in the agreed supply list. A custom project is separate from the standard RO500 or RO1000 equipment scope.
Can I begin before a complete water report is available?
Start with the information you have. State the water source, production use, required water quality, country, daily quantity, peak demand and available electrical supply. The missing information can then be identified before a final configuration is confirmed.
Send your factory’s water requirements
For a new installation, include the production application, water source and any analysis, required final-water specification, daily and peak demand, available power and site conditions. For a replacement, also describe the existing system and maintenance symptoms.
Request an industrial RO configuration
Looking for a standard capacity starting point? Review RO500 or RO1000. For quotation boundaries, use the equipment and site-scope checklist.