7 Essential Water Treatment Design Software Tools for Industrial RO Plants

Designing industrial water treatment systems, from high-recovery of RO plants to specialized ion exchange polishing, demands absolute thermodynamic precision to prevent catastrophic scaling and hardware failure. Optimizing these complex systems requires specialized design software tools that enable engineers and plant managers to model, simulate, and refine their designs effectively. However, the primary landscape of software design tools engineers rely on has been radically altered by aggressive corporate mergers and acquisitions. Navigating this shift, such as understanding the absorption of legacy tools like ROSA and CADIX into DuPont’s WAVE, or tracking SUEZ’s evolution into Veolia’s modern platforms, is no longer just an IT update; it is a critical project necessity to ensure accurate Capital Expenditure (CAPEX) and Operating Expenditure (OPEX) projections. Below are seven essential water treatment design software tools widely utilized in the industry, particularly for industrial RO plants:

WAVE (Water Application Value Engine) by DuPont Water Solutions

• Overview: WAVE is a comprehensive design software that integrates RO, ultrafiltration (UF) and ion exchange (IX) system modeling.
• Features:
  • Detailed system modeling with performance projections.
  • Energy consumption calculations for optimized design.
  • An extensive database of DuPont’s FILMTEC™ membranes.
• Benefits: Suitable for both novice and experienced designers, WAVE facilitates accurate system design and optimization, ensuring efficiency and reliability.

ROSA vs. WAVE

• The Shift: Legacy ROSA software relied on simplified volume-balance equations.
• The Modern Standard: WAVE and WAVE PRO mandate a transition to a mass-balance computational engine that actively calculates actual fluid compressibility and temperature-induced density changes.
• Deployment: WAVE operates via desktop (Windows XP SP3 through 10, SQL Server CE backend) or as the single-sign-on cloud interface, WAVE PRO.

Engineers operating legacy ROSA or CADIX platforms face a mandatory migration to WAVE or the browser-based WAVE PRO. Because WAVE integrates DuPont’s FilmTec, AmberLite, and IntegraFlux portfolios onto a single canvas, strict icon placement rules are enforced. This unified reporting structure allows facility designers to simulate complex flow interactions sequentially across multiple technologies. The numerical capacity of the engine natively supports highly complex configurations, accommodating 1-2 passes, 1-5 stages per pass, and 1-8 elements per pressure vessel. To accurately manage these internal flows, our step-by-step WAVE RO design tutorial shows how bypasses and stage-level concentrate recycle loops are calculated in exact percentages rather than raw volumetric rates. A primary operational constraint, however, is the platform’s strict vendor-locking for membrane projection.

Winflows™ by Veolia Water Technologies & Solutions

• Overview: Winflows™ is a robust tool for designing and analyzing RO, NF, and UF membrane systems.
• Features:
  • Precise predictions of system performance and operating costs.
  • A comprehensive library of Veolia’s membrane products and system components.
  • Functionality to compare different design scenarios with ease.
• The Winflows Advantage:
  • Primary Application: Excels in ultrapure water system design, specifically microelectronics and pharmaceutical applications requiring Electrodeionization (EDI).
  • Architecture: Winflows 5.0 operates entirely as a cloud-hosted (HTML5) application, natively supporting up to 3-pass RO configurations.
  • Legacy Compatibility: Seamlessly imports legacy .win files (from v4.0) while consolidating previous SUEZ/GE Water tools into a modern platform.

For process engineers designing ultrapure water systems, the deployment of Winflows hinges on its advanced EDI modeling capabilities. The designer must explicitly decide the parameters of the EDI stacks, dictating stack models and product flow rates to establish strictly targeted silica guarantees operating in the parts-per-billion (ppb) range.

Uniquely, the EDI simulation module executes highly specialized mechanical calculations that extend beyond standard water chemistry, mandating inputs for ventilation and blower sizing to ensure safe stack operations. Simultaneously, high-pressure system designers must determine the exact mechanical implementation of Energy Recovery Devices (ERDs). The platform forces the engineer to explicitly enable ERDs on industrial RO and NF unit operations, deciding between competing isobaric and centrifugal energy recovery topologies.

For a practical walkthrough of feed water inputs, membrane array configuration, and simulation warnings, follow our step-by-step Winflows RO design tutorial.

IMSDesign by Hydranautics (A Nitto Group Company)

• Overview: IMSDesign is user-friendly software for designing industrial RO membrane systems provided by Hydranautics.
• Features:
  • Detailed projections of water quality, flow rates, and system recovery.
  • A comprehensive database of Hydranautics’ membrane elements.
  • Multi-stage system design capabilities.
  • Considering flux decline and solute rejection changes due to aging and irreversible fouling in the design.
• IMSDesign Cloud & Turbo SWRO:
  • Deployment: As a fully cloud-based membrane projection platform (IMSDesign Cloud), it offers cross-platform compatibility (macOS/Android) entirely free from local installation restrictions.
  • Performance Boundary: Allows engineers to push Seawater RO (SWRO) beyond the conventional single-stage 35-45% recovery limit, utilizing a multi-stage turbo design to achieve 55-65% recovery.
  • Scaling Predictor: Prioritizes the Calcium Carbonate Precipitation Potential (CCPP) calculator, providing a quantitative mass evaluation (mg/L) over traditional LSI thermodynamics.

When conceptualizing large-scale seawater desalination facilities, engineers utilizing IMSDesign must make a critical topological decision regarding recovery boundaries. Traditional single-stage SWRO systems are tightly bounded at 35-45% recovery. However, IMSDesign explicitly supports an advanced multi-stage turbo design capability that pushes permeate recoveries up to 55-65%. This decision radically alters the required Capital Expenditure (CAPEX) for pumping infrastructure and the ongoing OPEX, but its successful implementation is absolutely reliant on complex inter-stage energy recovery dynamics. Furthermore, system designers must actively select the predictive index methodology used for inorganic scaling, favoring the Calcium Carbonate Precipitation Potential (CCPP) calculator over standard thermodynamic indices.

Toray DS2 Design Software by Toray Industries

• Overview: Toray DS2 is a comprehensive design tool for RO and NF membrane systems offered by Toray Industries.
• Features:
  • Accurate projections of system performance and permeate quality.
  • Database of Toray’s membrane products with detailed specifications.
  • Multi-stage design capabilities and detailed cost analysis.
  • The possibility of simulating fouling effects on RO membranes for system troubleshooting.
• DS2 Fouling Allowances:
  • The Differentiator: Toray DS2 forces engineers to assign a direct, numerical fouling allowance factor, refusing to hide performance degradation behind opaque background algorithms.
  • Default Baseline: Utilizes a standard default fouling factor of 0.65 for heavily impacted surface water systems to reflect realistic degradation.
  • Data Structure: Relies on a localized SQL Server Compact Edition (SQL CE) database using .sdf file formats, which can be scaled to full SQL instances via enterprise scripts.

When operating Toray DS2, process engineers are forced to make immediate decisions regarding empirical fouling allowances. Unlike software that defaults to idealized laboratory states, DS2 requires the engineer to explicitly dictate the severity of the expected feedwater fouling environment by establishing this numerical factor. The software natively prioritizes the generation of graphical trendlines depicting exact performance shifts versus time and operating temperature. This visualization is critical for accurately communicating longitudinal system degradation to project stakeholders and managing long-term lifecycle expectations.

AquaGRID by Toray Industries

• Overview: Aqua Design is specialized software for the design and simulation of water treatment systems using Lanxess’s ion exchange resins.
• Features:
  • Detailed modeling of ion exchange processes.
  • Database of Lewatit® ion exchange resins.
  • User-friendly interface with comprehensive reporting tools.
• Benefits: The software aids in designing efficient systems tailored to specific water treatment needs, enhancing overall system performance.

For engineers who want a full walkthrough of the interface, from initial component setup to troubleshooting flux warnings, see our step-by-step AquaGRID tutorial.

CADIX (DOW / DuPont)

The Legacy of CADIX

• Status: Officially obsolete and no longer maintained; its features have been fully absorbed into DuPont’s WAVE platform.
• Core Function: Standalone Ion Exchange (IX) modeling, specializing in detailed elution curves and breakthrough forecasting.
• Constraint: Operates as a “closed” architecture, preventing easy intermediate data sharing with upstream RO models.

CADIX (Computer Aided Design for Ion Exchange) was explicitly engineered to predict the performance of regenerable IX systems, providing highly detailed elution curves and breakthrough forecasts for complex operations like perchlorate or nitrate removal. For process engineers tasked with modeling these systems, the primary configuration required determining precise regeneration sequences. This involved deciding between co-current or counter-current regeneration solution velocities and establishing exact vessel length-to-diameter (L/D) ratios to ensure proper hydraulic distribution.

InGE System Design (BASF / DuPont)

The iSD Pretreatment Legacy

• Status: The standalone inge System Design (iSD) tool’s core capabilities have been directly integrated into DuPont’s overarching WAVE software following corporate acquisitions.
• Specialization: Highly calibrated for Multibore polyethersulfone (PES) hollow fiber membranes and dizzer module architectures.
• Core Decision: Engineers must choose the fundamental hydraulic operating mode: designing for constant flux versus designing for constant output.

When designing UF pretreatment systems, engineers utilizing the historical iSD platform or its modern WAVE equivalent must establish strict hydraulic boundaries. The designer must explicitly configure the filtration cycle sequence, deciding the exact duration of the filtration phase followed by the required backwash and Chemically Enhanced Backwash (CEB) intervals. Establishing these intervals correctly relies entirely on the accuracy of the feed water severity inputs. The reason is that the algorithms are specifically calibrated for Multibore PES hollow fiber capillaries and dizzer modules.

LewaPlus (LANXESS)

2D Complex Integration

• Core Capability: LewaPlus excels in Two-Dimensional (2D) complex treatment architecture, allowing seamless feed/permeate transfer between IX, RO, and UF processes.
• Specialized Analytics: Features Demi-Check (demineralization performance) and MB-Check (mixed-bed efficiency) to directly evaluate resin aging and cycle time forecasting.
• Constraint: While exceptionally robust for IX thermodynamics and kinetic decay, it is strictly limited to LANXESS resin limits and Lewabrane RO element data.

LewaPlus distinguishes itself by requiring engineers to determine the optimal sequential arrangement of fundamentally different chemical processes. Facility designers must decide how to dimension systems where Reverse Osmosis permeate is directly transferred as the feed parameter for an Ion Exchange module. This 2D architecture forces the software to solve complex multi-stage thermodynamic balances simultaneously rather than calculating unit operations in isolation. While it accurately models RO plants using Lewabrane element data, the platform’s primary computational superiority lies in the exhaustive depth of its ion exchange regeneration and kinetic decay libraries.

Comparison of Water Treatment Softwares

The “Best” Software & Cost Models

• Selection Logic: The “best” software for RO design depends entirely on the treatment train’s complexity. Integrated platforms (WAVE, LewaPlus) are superior for multi-technology trains, while specialized tools excel in isolated operations.
• Pricing Model: Is there free water treatment software? Yes. The vast majority of OEM-provided projection tools (including WAVE, Winflows, IMSDesign, and DS2) are free to access. However, they operate on a vendor-locked model that restricts simulations to their specific membrane and resin portfolios.

The landscape of water treatment software has been radically altered by corporate mergers and acquisitions, leading to a significant consolidation of legacy tools into unified platforms. Engineering directors must fundamentally decide whether their facility design requires a fully integrated, multi-technology platform or a highly specialized, single-process tool. This decision hinges on the complexity of the treatment train. For instance, if the design involves UF feeding into RO, followed by an Ion Exchange (IX) polishing step, utilizing an integrated software environment prevents the cascading thermodynamic errors that occur when manually moving intermediate data between standalone programs.

To navigate this M&A landscape effectively, engineers must track the ownership lineage of their software to ensure they are using actively supported versions. Veolia’s Winflows platform continues the legacy of SUEZ and GE Water projection tools, excelling in EDI integration. DuPont’s WAVE has fully absorbed legacy tools like ROSA, CADIX, and inge System Design, making it the premier multi-tech option. Meanwhile, Hydranautics’ IMSDesign stands out by being the first to offer a fully cloud-based projection environment (IMSDesign Cloud), allowing cross-platform compatibility. When evaluating and comparing software outputs from different manufacturers, engineers must ensure both platforms are adhering strictly to ASTM D4194 standard test conditions (25°C, 15% recovery) to guarantee baseline performance data is mathematically comparable.

Comparative Software Matrix & Manufacturer Ownership

Software Name	Primary Technology	Key Manufacturer	Delivery Platform	Pricing Model / Legacy Notes
WAVE / WAVE PRO	RO, UF, IX, CCRO	DuPont	Desktop / Cloud	Free / Replaces ROSA, CADIX, inge
Winflows	RO, NF, EDI	Veolia (SUEZ)	Cloud (HTML5)	Free / Absorbed legacy GE/SUEZ tools
IMSDesign	RO, NF, UF	Hydranautics	Cloud / Desktop	Free / First fully cloud-based simulator
DS2	RO, NF	Toray	Desktop	Free / Requires local SQL CE
LewaPlus	IX, RO, UF	LANXESS	Desktop / Cloud	Free / 2D complex treatment integration
CADIX	IX	DOW / DuPont	Desktop	Obsolete / Transitioned to WAVE
iSD (inge)	UF	BASF / DuPont	Desktop / Mobile	Obsolete / Transitioned to WAVE

Summary and Conclusion

Process Design vs. Plant Operations

• The Distinction: Predictive design software establishes the theoretical thermodynamic boundaries of the plant; operational systems maintain them.
• The Cloud Shift: The ecosystem is rapidly transitioning to comprehensive, cloud-hosted platforms (WAVE PRO, Winflows 5.0, IMSDesign Cloud) to eliminate manual IT patching and ensure database accuracy.
• Field Validation: Post-commissioning reality requires mathematical isolation of fouling from temperature variances using normalization tools like FTNORM.

The engineering design software ecosystem has rapidly transitioned from isolated, localized desktop applications to comprehensive, cloud-hosted platforms. Tools like WAVE PRO, Winflows 5.0, and IMSDesign Cloud ensure that engineers are always utilizing the most up-to-date membrane databases and algorithms without requiring manual IT patching. Facility managers and lead process engineers must finalize their software selection by directly matching a tool’s computational strengths with the specific operational demands of their site. The ultimate decision requires balancing the need for rigorous, predictive physics against the practical realities of the engineering workflow, including cloud accessibility and multi-technology integration.

The most crucial takeaway for any design engineer is that software projections are only as reliable as the physicochemical data entered into them. Incomplete feed water analyses, ignoring seasonal temperature limits, or misapplying legacy fouling factors will render even the most advanced simulation dangerously inaccurate. Post-commissioning, standard engineering practice dictates the daily calculation of Normalized Permeate Flow via specialized tools like FTNORM or TorayTrak. This mathematically isolates true membrane fouling from standard seasonal temperature variances, ensuring the physical plant is actually matching the software’s original aging assumptions