First, confirm 2 key data points quickly to avoid wrong troubleshooting directions:
1. Whether the product water resistivity drops below 15 MΩ·cm (standard conventional value) and whether the conductivity exceeds the standard;
2. Confirm if it is a sudden drop (ruling out gradual degradation caused by module aging). Check for abnormal fluctuations in flow rate, pressure, voltage and current, and record the abnormal occurrence time as well as recent operations (such as shutdown and restart, parameter adjustment).
Troubleshooting Steps
1. Abnormal inlet water (turbidity, excessive indicators) → Malfunction of pretreatment system (RO, activated carbon, softener);
2. Abnormal parameters (fluctuating voltage & current, unbalanced flow and pressure difference) → Rectifier failure or improper operation settings;
3. Module abnormality (leakage, excessive pressure difference) → Damaged membrane sheets, resin contamination or scaling;
4. Abnormality after restart → No protective measures taken during shutdown, resulting in resin deactivation.
Prevention Key Points to Avoid Sudden Water Quality Drop
Follow the operation and maintenance mantra:"Check inlet water quality first, then flow and pressure difference; verify current and voltage next, finally inspect sealing and power supply; maintain regular cleaning and control recovery rate, strictly prohibit dry burning and oxidation."
Focus on three core measures:
① Strictly control inlet water indicators and perform regular maintenance on the pretreatment system;
② Follow the startup and shutdown procedure: Feed water first then power on; cut off power first then stop water supply;
③ Seal and store the module properly during long-term shutdown; flush and regenerate first after restart, and calibrate instruments and probes regularly.
Following the above steps allows you to accurately locate the core cause of EDI water quality drop within 3 minutes, adopt emergency measures rapidly, and minimize production downtime and equipment loss.If the problem remains unsolved after troubleshooting, it is recommended to contact professional technical manufacturers. Do not disassemble the module privately to prevent irreversible damage.