Local physicochemical laboratories, small-scale precision processing plants, and high-end electronic component cleaning workshops are almost all equipped with small ultrapure water systems to meet the extremely high water quality requirements of scenarios such as reagent preparation, precision workpiece rinsing, and high-end process water replenishment. Many users encounter a sudden drop in the water production rate of these small ultrapure water systems during long-term use: the equipment starts normally upon power-on, but the actual water flow rate is halved, the time to fill the storage tank doubles, and water supply cannot keep up during peak periods, directly disrupting experimental progress and slowing down production. In most cases, it's not a complete failure of the equipment, but rather a common hidden problem such as aging and clogging of consumables, partial blockage of pipelines, or abnormal operating pressure. Accurately locating the source of the fault and addressing it accordingly can restore the equipment to its original rated capacity within a few hours.
Ultrapure Water System
The core faults causing slow water production in small ultrapure water systems can be precisely categorized into four types of causes specific to the local conditions in Northwest China. The first type of problem is complete clogging of the pretreatment filter cartridges. PP cotton and activated carbon filters, after prolonged use and interception of high sediment and residual chlorine impurities in local well water, directly cause water circuit blockage and severely insufficient inlet flow. The second type is fouling and scaling of the RO reverse osmosis membrane. The hardness of raw water in Shaanxi is generally high, and the lack of regular acid washing leads to calcium scale clogging the membrane pores, causing the permeation efficiency to drop below 30% of the rated value. The third type is insufficient output pressure from the high-pressure pump. Aging pump head seals and excessive fluctuations in the plant's power supply voltage can both cause the inlet pressure to fall below the membrane element's rated operating threshold, resulting in a continuous decrease in permeate flow. The fourth type is partial blockage in the post-pipeline or wastewater throttling valve, or abnormal pressure relief in the pressure storage tank, causing obstructed water circulation and a sharp increase in outlet resistance. Addressing these different fault points by replacing compatible consumables, offline cleaning of the membrane element, and calibrating and repairing power components can quickly and efficiently resolve the problems.
Real-world Fault Repair Case
A small ultrapure water system at a precision third-party testing laboratory in Xi'an recently experienced a sudden and significant slowdown in water production. What used to take one hour to fill the storage tank now takes twice as long, causing water supply interruptions during peak testing periods and severely hindering the daily report generation process. The customer attempted a simple flush of the pre-filter, but the problem persisted, making it impossible to pinpoint the underlying cause. They then contacted DIEN Water Treatment for a comprehensive on-site inspection and repair.
Ultrapure Water System
After conducting a full-process, stage-by-stage pressure test, our technicians identified a double fault: the pre-filters (PP cotton and activated carbon) had not been replaced for three months and were completely clogged with sediment and impurities; simultaneously, the reverse osmosis membrane was covered with a large amount of calcium scale and colloidal impurities, causing partial blockage of the membrane pores and a significant decrease in the water permeation rate. A targeted repair plan was developed: The pre-filter cartridge was replaced with a brand new, gradient-density precision filter, and the inlet water path was thoroughly cleared; the reverse osmosis membrane underwent a specialized food-grade chemical cleaning process to completely remove surface dirt and scale; the high-pressure pump output pressure and pipeline valve diameters were tested section by section, equipment operating parameters were calibrated, all hidden faults were identified, and the entire machine was tested and calibrated with water.
Xi'an DIEN Water Treatment specializes in the R&D, production, and full-cycle after-sales maintenance of small ultrapure water systems. With its own 3000-square-meter production workshop, all core components are of top-tier industrial quality, resulting in a significantly lower failure rate than the industry average, ensuring long-term stable and durable operation. A dedicated local after-sales engineering team covers the entire Shaanxi province, with an on-site response time of ≤12 hours. They provide a one-stop, full-chain service including equipment inspection, regular maintenance, and trade-in, making them a reliable long-term partner for ultrapure water equipment for local businesses and laboratories.
