1. Choose the issue
Find the closest process, equipment item, or symptom.
Engineering diagnostics
Describe the symptom and troubleshoot it step by step
Choose the closest observed issue. The diagnostic asks one question at a time; unknown items can be marked or deferred, while flow, pressure, and quality values can be entered for local calculations. Possible causes update from both answers and numeric evidence.
You only need to do three things
2. Answer and calculate
Answer one question at a time and use local calculations when measured values are available.
3. Read the result
See possible causes, numeric evidence, supported or excluded directions, and the next recommended check.
Available now
Diagnostic library available
Choose the item closest to what you observe. Each page explains what is useful to have before asking one question at a time.
70 available diagnostics
Ready to useReverse osmosis and nanofiltration
High RO permeate conductivity and salt passage
Use this when
RO permeate conductivity or salt passage is high, but you do not yet know whether the cause is measurement, feed and operating conditions, seal bypass, fouling, scaling, or membrane damage.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
Declining normalized RO permeate flow and flux
Use this when
You observe declining normalized ro permeate flow and flux, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
Rising RO stage pressure drop
Use this when
You observe rising ro stage pressure drop, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
RO recovery, concentrate, water and salt balance anomalies
Use this when
You observe ro recovery, concentrate, water and salt balance anomalies, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
RO fouling, scaling, compaction and damage differentiation
Use this when
You observe ro fouling, scaling, compaction and damage differentiation, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
Ineffective RO cleaning, poor recovery and rapid recurrence
Use this when
You observe ineffective ro cleaning, poor recovery and rapid recurrence, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
RO oxidant and out-of-limit chemical exposure
Use this when
You observe ro oxidant and out-of-limit chemical exposure, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
RO vessel seal, interconnector and product-tube bypass leaks
Use this when
You observe ro vessel seal, interconnector and product-tube bypass leaks, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
RO startup, shutdown, water hammer, backpressure and mechanical events
Use this when
You observe ro startup, shutdown, water hammer, backpressure and mechanical events, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingReverse osmosis and nanofiltration
Rising RO pressure and specific energy
Use this when
You observe rising ro pressure and specific energy, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingUF, MBR and membrane separation
UF TMP rise and normalized permeability decline
Use this when
You observe uf tmp rise and normalized permeability decline, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingAvailable · Professional review pendingUF, MBR and membrane separation
UF filtrate turbidity and integrity anomalies
Use this when
You observe uf filtrate turbidity and integrity anomalies, but do not yet know whether measurement, operation, equipment, or work practices are responsible.
✓ One question at a time✓ Start with missing data✓ Save and export a report
Start troubleshootingBrowse by process and equipment scope
Choose the closest treatment stage, then narrow to the specific symptom. Rule IDs are not required.
70 diagnostic topics are now available
The library covers membranes, biological treatment, solids separation, disinfection and oxidation, equipment, industrial water, high-purity water, and integrated systems. Topics awaiting professional review are clearly marked.