Services_Shuoke Environmental Protection Engineering Equipment (Suzhou) Co., Ltd.

FAQs

01What May Cause a Sudden Rise in Product Water Conductivity?

Problem Analysis:: This issue usually points to a core desalination component failure. Main possible causes include: contamination, scaling or end-of-life of RO membrane elements; abnormal feed water quality, temperature or pressure to the RO system; or improper current settings or failure of the EDI module.
Solutions:: First inspect and clean the RO membrane; replace it if cleaning is ineffective. Check the normal operation of the pretreatment system (e.g. water softener, filters) to ensure stable RO feed conditions. For the EDI system, check the rectifier current and module flow, and perform regeneration or replacement if necessary.

02How to Deal with a Significant Drop in Equipment Water Production?

Problem Analysis:: A decrease in water production is mostly related to blockage in the flow path. Common causes include clogging of the pre-security filter element, fouling of the RO membrane, insufficient power supply to the high-pressure pump, or degraded performance of the pump itself.
Solutions:: Inspect and replace the security filter element in sequence. Then perform chemical cleaning on the RO membrane. At the same time, check the inlet and outlet pressure of the high-pressure pump to ensure it operates within rated parameters.

03Why Does the System Start and Stop Automatically and Frequently?

Problem Analysis:: Frequent start-stop cycles are usually caused by unstable control signals or unstable feed water supply. Possible causes include: faulty level sensor in the pure water tank sending incorrect signals; excessive fluctuation in raw water supply pressure; or program disorder in the control system (e.g. PLC) and poor contact in electrical circuits.
Solutions:: Calibrate or replace the level sensor of the pure water tank.

Check the raw water pump and pressure stabilizing device to ensure stable water supply pressure.

Finally, troubleshoot the PLC control program and electrical contacts.

04Why Do Microbial Indicators Still Fail to Meet Standards After Ozone Disinfection?

Problem Analysis:: Poor disinfection effect is mainly due to insufficient ozone concentration or insufficient contact time. Possible causes include insufficient ozone output caused by ozone generator failure, inaccurate reading of the ozone concentration monitor leading to ineffective dosage, or insufficient water circulation time so that ozone cannot fully contact and inactivate microorganisms.
Solutions:: First, maintain or calibrate the ozone generator to ensure its output. Then calibrate the online ozone concentration monitor. Finally, review the disinfection circulation procedure to ensure adequate contact retention time.

05How to Troubleshoot Excessive TOC or Conductivity in the Product Water of a Multi-effect Distiller (Med)?

Problem Analysis:: This is a critical alarm for Water for Injection (WFI) quality. There are three main causes: substandard feed water (purified water) quality; scaling or fouling inside the distiller; or failure of the vapor-liquid separator resulting in steam carryover.
Solutions:: Immediately test the quality of upstream purified water. Perform cleaning or descaling procedures on the distiller. Check the evaporation rate in the evaporation chamber and the condition of the separator to ensure separation efficiency.

06What Is the Most Common Cause of Microbial Exceeding Limits in the Distribution Piping System?

Problem Analysis:: This is the highest risk point for Water For Injection (WFI) systems. The root cause is that microorganisms have obtained favorable conditions for growth: the circulation water temperature is not continuously maintained above 70°C, or the pasteurization cycle is improper; the tank respirator filter is damaged, wet, or insufficiently sterilized; or there are dead legs or low local flow velocity in the piping network.
Solutions:: First, check and ensure the circulation heating system works normally with stable qualified temperature. Replace or re-sterilize the respirator filter immediately. Audit the piping design and eliminate low-flow points by adjusting valves or pump frequency.

07What to Do if the Transfer Pump Makes Abnormal Noise or Insufficient Flow During Operation?

Problem Analysis:: This is a mechanical failure. Abnormal noise may result from worn mechanical seals or cavitation. Insufficient flow may be caused by foreign matter in the pump chamber, damaged impeller, or faulty drive power (such as inverter failure).
Solutions:: Stop the pump for inspection, replace worn mechanical seals, and check the inlet pipeline to prevent cavitation. Disassemble the pump, remove internal foreign matter or replace the damaged impeller. Check the inverter output and motor power supply.

08How to Stabilize Excessive Temperature Fluctuations at the End-Use Points of the Distribution System?

Problem Analysis:: Temperature fluctuations weaken the system’s ability to control microorganisms. Main causes include: scaling on the plate heat exchanger causing uneven heat transfer efficiency; inaccurate temperature sensor (TIPT) or malfunction of the control valve (TV); and simultaneous high water consumption at multiple use points exceeding the designed thermal load.
Solutions:: Clean and descale the heat exchanger. Calibrate the temperature sensor and check the opening feedback and response of the control valve. Standardize on-site water usage procedures, or re-evaluate whether the system thermal load design meets current actual demand.

09Why Is the Conductivity of 2nd-Stage Ro Product Water Consistently High with Increased Differential Pressure?

Problem Analysis:: This usually indicates severe fouling or scaling of the RO membrane system. Possible causes include reduced pretreatment performance (e.g., failed softener, improper antiscalant dosing), feed water quality fluctuations beyond the design range, or excessively high recovery rate leading to accelerated scaling on the concentrate side.
Solutions:: Perform chemical cleaning of the RO membrane immediately and verify the cleaning effect. Thoroughly inspect the pretreatment unit, and calibrate the softener regeneration cycle and antiscalant dosage. Optimize the system operating recovery rate, and avoid high-load operation when feed water quality deteriorates.

010How to Handle the Decrease in Edi Module Outlet Resistivity Accompanied by Module Overheating?

Problem Analysis:: This is a typical symptom of abnormal current in the EDI module. The main causes are substandard influent water quality (e.g., high CO₂ or silica content), leading to overloaded ion load inside the module; or rectifier failure, causing abnormal rise in output current and “overcurrent” heating.
Solutions:: First, test the EDI influent water quality to ensure the upstream RO product water meets requirements. Inspect and calibrate the rectifier to ensure operating voltage and current are within the module’s rated range. If the module has degraded, perform regeneration procedures or consider replacement.

011How to Troubleshoot Frequent Low-Pressure Alarms and Failure to Start Normally?

Problem Analysis:: A low-pressure alarm is directly related to water supply power. Possible causes include failure of the raw water pump, excessive inlet resistance due to clogged pre-filters, improper setting of the low-pressure protection switch, or sensor malfunction.
Solutions:: Check in sequence:
1.Operating status and outlet pressure of the raw water pump;
2.Inspect and replace potentially blocked components such as multi-media filters and security filters;
3.Calibrate the pressure setting of the low-pressure protection switch.

012Why Can’t the Terminal Product Water Resistivity Reach the Theoretical Maximum of 18.2 Mω·cm and Remain Unstable?

Problem Analysis:: This indicates failure of the final polishing purification stage. The most common causes are: exhaustion and failure of the polishing mixed‑bed resin; trace contamination in the system (e.g., leaching from tank respirators or piping materials); additionally, air bubbles or fouling in the on‑line resistivity sensor cell can cause inaccurate readings.
Solutions:: Replace the polishing mixed‑bed resin cartridge. Inspect and replace the tank respirator filter element to ensure system tightness. Vent and clean the sensor cell, and calibrate the instrument if necessary.

013What Should Be Inspected First When the Terminal Toc (Total Organic Carbon) Exceeds the Limit?

Problem Analysis:: Excessive TOC in ultrapure water mainly results from the introduction or ineffective removal of organic matter. Sources include: high baseline TOC in the pre-stage pure water supply; weakened intensity or end-of-life of the 185nm UV lamp, leading to insufficient organic oxidation; or organic leaching from system piping and fittings.
Solutions:: Measure the TOC value of the pre-stage water supply. Inspect and replace the 185nm UV lamp to ensure sufficient radiation intensity. Identify and replace non-compliant piping materials (such as ordinary PVC) that may leach organic substances.

014Why Does the Particle Count at the Point-of-Use Exceed the Standard? Which Links May Be Faulty?

Problem Analysis:: Particle contamination usually comes from the final filtration barrier or mechanical friction. The main suspected points are damage or seal failure of the final fine filter (such as 0.2μm or 0.1μm filter elements), or friction particles generated by the operation of the high-purity water pump at the end of the system.
Solutions:: Replace the final fine filter element immediately and check the sealing rings. Inspect the operation status of the high-purity water pump and check whether it is caused by wear of internal components of the pump.

015Why Is the Conductivity or Toc of the Return Water in the Circulation System Higher Than That of the Water Supply Point?

Problem Analysis:: This is a clear sign of contamination in the distribution system. Possible causes include: microbial growth and biofilm formation inside the system; leaching of contaminants from the inner pipe wall; or the presence of dead legs in the system, where local water stagnation and deterioration then mix into the main flow.
Solutions:: Initiate and implement a more thorough disinfection procedure (e.g., hot water disinfection, chemical disinfection). Conduct investigation and renovation of system dead legs to ensure the entire system meets 3D dead leg design requirements. Perform chemical cleaning of the pipes if necessary.

016How to Resolve the Issue That the System Circulation Flow Rate Keeps Decreasing and Fails to Reach the Design Value?

Problem Analysis:: A drop in flow rate indicates insufficient circulation power or excessive resistance. The main causes may be performance degradation of the circulation pump, blockage of filters in the main or branch circuits, or failure / incomplete opening of automatic valves (e.g., point-of-use diaphragm valves) in the system.
Solutions:: Check the operation curve and actual head of the circulation pump. Inspect, clean or replace the in-line filters in the distribution system. Verify the open/close status of all pneumatic and electric valves to ensure normal operation.

017Why Does Trace Oxygen or Carbon Dioxide That Is Difficult to Eliminate Always Exist in the System and Affect Water Quality?

Problem Analysis:: Gas dissolution is usually related to system tightness. The main causes are failure of the nitrogen sealing system of storage tanks, damage to respirators, or air ingress during water replenishment and disinfection.
Solutions:: Inspect and repair the nitrogen sealing system to ensure the storage tank maintains a slight positive pressure. Replace the respirator filter element of the storage tank. Review the operating procedures for water replenishment and disinfection to prevent air from being drawn into the closed system.

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