Factory-direct RO, ultrafiltration, ultrapure, purified-water and accessory support for overseas project buyers
What data to send [email protected]
Xinnuo WaterWater Treatment Equipment

Home / Products / Reverse Osmosis RO Pure Water Equipment

Reverse Osmosis RO Pure Water Equipment

Double Stage RO Pure Water Equipment

A two-pass RO system where first-pass permeate feeds a second RO stage, providing lower conductivity for purified process water and demanding production applications.

Check required dataBack to Reverse Osmosis RO Pure Water Equipment
0.25-50 m3/h double stage ro pure water equipment configured for reverse osmosis ro pure water equipment
Quick quotation

Confirm this equipment for your project

Send source water, flow rate, voltage and target quality. We will confirm whether this model fits before quotation.

WhatsApp engineer
  • Capacity0.25-50 m3/h by project
  • ProcessPretreatment + first-pass RO + intermediate section + second-pass RO
  • Membrane format4040 or 8040 spiral-wound RO elements
  • Overall desalination>=99.5% reference
  • Product conductivity0.5-5 uS/cm at 25 C under suitable feed conditions
  • Combined recovery70-85% by project

Factory direct supply, project configuration, packing and voltage checked before price.

PARAMETERS

Technical Specifications

ParameterValue
ProcessPretreatment + first-pass RO + intermediate section + second-pass RO
Capacity0.25-50 m3/h by project
Membrane format4040 or 8040 spiral-wound RO elements
Overall desalination>=99.5% reference
Product conductivity0.5-5 uS/cm at 25 C under suitable feed conditions
Combined recovery70-85% by project
Stage 1 pressure0.8-1.2 MPa reference
Stage 2 pressure1.5-2.0 MPa reference
Feed SDI<5
Residual chlorine<0.1 mg/L
Feed turbidity<1 NTU
ControlPLC automatic control with conductivity interlocks and flushing
Power supply220/380/415 V, 50/60 Hz by destination
APPLICATIONS

Typical Applications

ApplicationWhere this equipment fits
Application 1Purified process water and clean production rooms
Application 2Food, beverage, cosmetics and ingredient water
Application 3Laboratory and testing support water
Application 4Front-end desalination before EDI or further polishing
PROCESS FLOW

Double-stage reverse osmosis process

Pretreated water enters the first RO stage. First-pass permeate is buffered and adjusted as required before a second high-pressure pump sends it through the second RO membrane stage. Conductivity is monitored at the feed, intermediate and final product points.

  • Raw-water pretreatment and precision filtration
  • First-stage high-pressure pump and RO array
  • Intermediate tank or buffer section
  • Second-stage pH adjustment when required
  • Second-stage high-pressure pump and RO array
  • Multi-point conductivity, pressure and flow instruments
  • PLC cabinet with automatic flushing and interlocks
Double Stage RO Pure Water Equipment process flowchart
Double Stage RO Pure Water Equipment process route used for engineering discussion before quotation.
WATER TREATMENT PRINCIPLE

Why two RO stages produce lower conductivity

The first RO stage performs the main desalination. Its permeate becomes the cleaner feed for the second RO stage, allowing the second pass to reduce the remaining ionic load further.

Two-pass performance depends on feed temperature, first-pass recovery, pH adjustment, membrane selection and the final water target. Reference values must be confirmed against the project analysis.

WHY THIS ROUTE

Practical advantages for selection

  • Lower final conductivity than a one-pass RO route
  • Independent monitoring of both RO stages
  • Can be configured before EDI or sanitary downstream treatment
  • All common capacities remain model rows rather than duplicate products
MODEL RANGE

Available Configurations

Model rangeBest fitSelection note
0.25 m3/hCompact commercial or laboratory use4040 membrane layout; final pump and membrane count follow feed water
0.5 m3/hSmall production lineCompact skid with automatic flushing and conductivity monitoring
1 m3/hLight industrial process waterStandard small industrial configuration
2 m3/hFactory process waterCommon continuous-production model
5 m3/hMedium production demand8040 membrane array selected by recovery target
10 m3/hCentral workshop supplyExpanded pretreatment, pump and membrane configuration
20 m3/hLarge industrial pure waterProject skid with site connection and recovery review
50 m3/hCentral water plantLarge-flow project configuration based on full water analysis
PROJECT OPTIONS

Configuration Options

  • Stainless steel skid and piping
  • CIP cleaning skid
  • UV or ozone disinfection
  • EDI polishing
  • Sanitary product-water tank and loop
QUOTE DATA

Before quotation, send these details

  • Required product-water flow and daily operating hours
  • Raw-water source, TDS and full analysis report when available
  • Target conductivity, resistivity or application standard
  • Destination country, voltage, phase and frequency
  • Installation space, tank arrangement and connection points
  • Required automation, monitoring and installation support
BUYER QUESTIONS

Questions buyers usually ask before quotation.

Use these checks to decide whether the route is close enough before sending water data.

Is double-stage RO the same as two membrane housings?

No. Double-stage means permeate from the first RO pass is treated by a second complete RO pass, not simply multiple vessels in one array.

Can the system guarantee 0.5 uS/cm for every raw water?

No. The stated conductivity is a reference range under suitable feed and operating conditions; the design must be checked against the water analysis.

Can EDI be added later?

Yes, if the second-pass RO quality, flow, tank and control interfaces are designed for the selected EDI module.

PRODUCT ROUTE

Check whether another route fits better.

Use the route cards to avoid comparing the wrong equipment family before water data is checked.

DesalinationReverse Osmosis RO Pure Water Equipment equipment route with water treatment system image for quotation selectionReverse Osmosis RO Pure Water EquipmentSingle-stage and double-stage RO selected by feed water and final conductivity.View familyMembrane filtrationUltrafiltration Equipment equipment route with water treatment system image for quotation selectionUltrafiltration EquipmentPVDF UF equipment for turbidity, colloid and suspended-solids control.View familyHigh purityUltrapure Water Equipment equipment route with water treatment system image for quotation selectionUltrapure Water EquipmentRO + EDI systems selected by final resistivity, flow and loop requirements.View familyClean productionPurified Water Equipment equipment route with water treatment system image for quotation selectionPurified Water EquipmentStainless double-pass RO with sanitary storage and distribution options.View familyRO replacementWater Treatment Accessories equipment route with water treatment system image for quotation selectionWater Treatment AccessoriesRO membrane elements matched by format, model and operating conditions.View family
RELATED MODELS

Related Products

0.25-50 m3/h single stage ro pure water equipment configured for reverse osmosis ro pure water equipmentSingle Stage RO

0.25-50 m3/h - Reverse Osmosis RO Pure Water Equipment

View model0.25-20 m3/h typical project range ro + edi ultrapure water equipment configured for ultrapure water equipmentRO + EDI Ultrapure

0.25-20 m3/h typical project range - Ultrapure Water Equipment

View model0.5-20 m3/h typical project range stainless steel purified water equipment configured for purified water equipmentStainless Purified Water

0.5-20 m3/h typical project range - Purified Water Equipment

View model