Reverse Osmosis Engineering Tools
Practical calculators for reverse osmosis water treatment, desalination and system analysis.
RO Engineering Workbench
Design basis, linked calculations, engineering checks, and review — connected RO work in one workspace.
RO Design Studio
Guided RO design exploration with staging and membrane configuration.
Tools at a glance
Visual GuideEach visual shows exactly what its calculator computes. Select any tool to open it.
RO Recovery Calculator
Calculate RO permeate and concentrate flow from feed flow and system recovery rate.
Open tool →RO Mass Balance Calculator
Simplified TDS-based dissolved-solids balance for RO feed, permeate, and concentrate flow and quality checks.
Open tool →RO Permeate TDS Calculator
Project expected permeate total dissolved solids based on feed water salinity and rejection specs.
Open tool →RO Osmotic Pressure Calculator
Estimate RO feed osmotic pressure using a simplified van’t Hoff model from TDS, temperature, and solute properties.
Open tool →RO Scaling Risk & Pretreatment Analysis
Screen CaCO3 scaling risk in RO feed and concentrate using the Langelier Saturation Index (ASTM D3739) and the Stiff & Davis Stability Index (S&DSI) for high-TDS and seawater feeds.
Open tool →RO Design Studio
Build a preliminary RO system design with feed inputs, staging, custom membrane data, sequential element estimates, balances, and warnings.
Open tool →Flow & Recovery
2 Live ToolsRO Recovery Calculator
Calculate RO permeate and concentrate flow from feed flow and system recovery rate.
Recovery (%) = (Permeate Flow / Feed Flow) × 100 RO Concentrate Flow Calculator
Compute brine/reject flow rates and volumetric stream balances for disposal or ZLD design.
Qc = Qf - Qp = Qf × (1 - Y / 100) RO System Process Diagram
Explore the RO train — Feed, Pretreatment, High-pressure pump, Membrane, Permeate and Concentrate — and jump straight to the calculator for each stage. Feed, Permeate and Concentrate flows light up from your saved results.
Water Quality
3 Live ToolsRO Salt Rejection Calculator
Calculate membrane salt rejection percentage from feed and permeate TDS concentrations.
Rejection (%) = (1 - (Cp / Cf)) × 100 RO Salt Passage Calculator
Determine salt passage percentage through RO membranes and verify complementary rejection balance.
Passage (%) = (Cp / Cf) × 100 RO Permeate TDS Calculator
Project expected permeate total dissolved solids based on feed water salinity and rejection specs.
Cp = Cf × (1 - R / 100) Design & Mass Balance
3 Live ToolsRO Design Studio
Build a preliminary RO system design with feed inputs, staging, custom membrane data, sequential element estimates, balances, and warnings.
Q = A × S × (ΔP − Δπ) RO Mass Balance Calculator
Simplified TDS-based dissolved-solids balance for RO feed, permeate, and concentrate flow and quality checks.
Qf · Cf = Qp · Cp + Qc · Cc RO Osmotic Pressure Calculator
Estimate RO feed osmotic pressure using a simplified van’t Hoff model from TDS, temperature, and solute properties.
π = i × C × R × T RO Membrane Sizing Calculator
Calculate required number of membrane elements and pressure vessels from design flux.
RO Engineering Workbench
Connect RO calculations into a traceable engineering workflow.
Energy & Cost
1 Live ToolsRO Energy & Specific Power Calculator
Determine specific energy consumption (kWh/m³) based on operating pressure and pump efficiency.
RO Operating Cost (OPEX) & SEC Calculator
Estimate RO operating expenditure: pumping energy (specific energy consumption), chemical cleaning, antiscalant, and membrane replacement.
SEC = P_feed × Q_f/(η_pump·Q_p) · OPEX = Σ (energy + chemical + membrane + maintenance)