The RCP400-20EPP is an industrial-grade ultra-large-specification water treatment filtration product engineered with advanced Enhanced Polypropylene (EPP) membrane technology, exclusively optimized for 20 L/m²·h ultra-stable low flux and high-precision deep purification in ultra-large-capacity water treatment scenarios that demand extreme effluent quality, long-term operational stability and massive processing volume, such as municipal central water supply deep treatment, high-end industrial ultra-pure water preparation, large-scale wastewater advanced treatment and resource reuse, and brackish water desalination projects. As the ultra-large-spec low-flux flagship model of the EPP membrane series, it features an extra-expanded high-efficiency filtration area, a high-purity high-selectivity heavy-duty anti-fouling EPP membrane core, and a reinforced industrial-grade pressure-resistant and anti-corrosion structural housing with integrated sealing technology. This heavy-duty design achieves an optimal balance between ultra-large processing capacity, ultra-stable low flux and reliable high-precision purification, a core advantage tailored for large-scale water treatment projects that prioritize effluent quality consistency and long-term low-loss operation over high flux efficiency. The product is fully compatible with industrial large-diameter pressure pipeline systems, supports flexible modular parallel and series operation for on-demand system capacity expansion and purification precision adjustment, and boasts excellent anti-pollution, high-load resistance and broad water quality adaptability. It enables stable continuous long-term operation with complex raw water sources (surface water, groundwater, industrial secondary water, municipal sewage effluent) after simple targeted pre-treatment (5 μm coarse filtration). With a humanized heavy-duty modular structure, the RCP400-20EPP is easy to install, operate and maintain, and serves as a cost-effective, high-reliability core filtration solution for ultra-large-capacity low-flux high-precision water purification projects, realizing municipal high-standard drinking water deep preparation, large-scale industrial ultra-pure water production, large-flow wastewater advanced treatment and resource high-value reuse with ultra-low energy consumption and consistent long-term performance.

The RCP400-20EPP features an ultra-high nominal filtration precision of 0.005 microns, with a nanoscale uniformly microporous EPP membrane surface formed by advanced phase inversion, high-density molding and precision pore-forming technology. The membrane pore size distribution is extremely consistent, and there are no filtration blind spots even under the ultra-large load low-flux operation of 20 L/m²·h and continuous massive water passing volume. This high-precision deep filtration capability can effectively intercept and remove submicron suspended solids, colloidal particles, bacteria, viruses, algae spores, micro-particle impurities, macromolecular organic pollutants and even fine colloidal organic matter in raw water, ensuring that the effluent water quality stably meets national and industrial Grade I ultra-pure water standards and the strictest international pure water quality requirements, fully satisfying the extreme purity demands of municipal high-standard drinking water supply, high-end electronic component manufacturing, pharmaceutical raw material water preparation and large-scale wastewater advanced treatment. The filtration precision remains completely unaltered with slight fluctuations in inlet water turbidity (≤20 NTU), temperature (4℃-42℃) and impurity content within a reasonable range, avoiding any micro-impurity leakage and providing a solid and reliable technical guarantee for subsequent high-precision water treatment processes or direct use in various ultra-large-flow low-flux high-precision water demand scenarios.

Under standard operating conditions (25℃, rated working pressure), the RCP400-20EPP achieves a pure water flux of 20 L/m²·h—an ultra-stable low flux design exclusively tailored for its 400 ultra-large-spec filtration area and heavy-duty long-term operating conditions. Different from medium and high-flux large-spec models, this low flux setting is optimized for extreme operational stability, high-precision deep purification and ultra-long service life, breaking the traditional trade-off between ultra-large processing capacity, filtration precision and membrane service life of large-spec filtration products. The product’s optimized low-resistance laminar flow channel design and high-permeability low-flux EPP membrane material effectively eliminate flux attenuation caused by membrane fouling and long-term high-load operation; within the normal operating range (water temperature 4℃-42℃, inlet water turbidity ≤20 NTU), the flux remains extremely stable with a monthly attenuation rate of ≤1.5% during long-term continuous operation. This ultra-stable low-flux performance, combined with the extra-expanded ultra-large filtration area, forms the massive high-precision processing capacity of the product, fully meeting the ultra-large-volume high-precision water demand of municipal centralized high-standard water supply systems, large-scale high-end industrial production bases, municipal sewage advanced treatment plants and large-flow brackish water desalination projects, while ensuring ultra-high purification precision and long-term operational stability, and effectively guaranteeing the consistency and high standard of effluent quality in ultra-large-capacity operation.

The RCP400-20EPP delivers excellent and ultra-stable salt rejection performance under standard 400 ultra-large-spec low-flux high-load operating parameters, with a 99.0% rejection rate for monovalent inorganic salt ions and a 99.6% rejection rate for divalent inorganic salt ions—performance levels that far surpass conventional EPP membrane products of the same specification and set a high industry standard for ultra-large-spec low-flux polypropylene filtration products. The ultra-dense, high-purity selective separation layer of the enhanced EPP membrane material forms a highly efficient ion barrier with strong molecular selectivity, which can effectively block the passage of various salt ions, inorganic impurities, dissolved solids and trace mineral ions while ensuring the smooth and rapid penetration of water molecules even under the low-flux high-load operation of 20 L/m²·h and ultra-large water passing volume. The salt rejection rate remains extremely stable (variation ≤0.2%) even with slight fluctuations in inlet water salinity (≤5000 mg/L) and operating pressure, making the product an ideal core filtration choice for large-scale ultra-pure water preparation, municipal high-standard drinking water deep purification, high-end industrial process water deep softening, large-scale brackish water desalination and large-flow wastewater advanced desalination treatment in industries with strict salt content limits such as electronic chip manufacturing, pharmaceutical GMP production, food and beverage deep processing and municipal water supply.

During normal continuous operation at rated 20 L/m²·h low flux and standard water temperature (25℃), the pressure drop of the RCP400-20EPP is strictly controlled within the ultra-low range of 0.06-0.10 MPa. Aiming at the 400 ultra-large-spec filtration area and massive water passing volume of low-flux operation, the product adopts a highly optimized heavy-duty low-resistance internal structural design, including a smooth large-diameter water inlet/outlet channel, a high-porosity high-strength porous support layer with uniform pore distribution, a streamlined multi-channel laminar flow filtration core layout and integrated low-resistance water distribution technology, which minimizes water flow resistance in the filtration process to the greatest extent and avoids local pressure loss caused by massive water volume passing and high-precision deep filtration. This ultra-low pressure drop performance for ultra-large-spec low-flux operation significantly reduces the energy consumption of the water treatment system’s booster pump and water delivery pump, lowers the overall operational energy cost of the ultra-large-capacity high-precision water treatment system by more than 30% compared with conventional large-spec products, and fundamentally avoids membrane core damage and structural deformation caused by excessive pressure accumulation in the pipeline and filtration core under large-flow low-flux high-precision operation. The pressure drop has almost no obvious increase during the normal service life; a slight rise (≤0.02 MPa) is only observed when regular deep cleaning is required, which is easy to identify and handle, ensuring the long-term stable, ultra-energy-efficient and low-loss operation of the entire ultra-large-capacity low-flux high-precision water treatment system.

The Molecular Weight Cutoff of the RCP400-20EPP is accurately calibrated at 700 Da (Daltons), a precise setting tailored for its 400 ultra-large-spec filtration area, 20 L/m²·h ultra-stable low flux and ultra-large-capacity high-precision deep water treatment scenarios. This MWCO value enables the precise selective interception of small and medium molecular weight impurities in water while allowing water molecules and beneficial trace inorganic small molecules to pass through smoothly—even under continuous low-flux high-load operation with ultra-large water passing volume and high-precision deep filtration. This optimized MWCO performance can effectively block trace organic small molecules, colloidal substances, low-molecular-weight polymers, protein impurities, polysaccharides, humic acid and other micro-pollutants with a molecular weight higher than 700 Da, and is specially suitable for the high-precision deep separation and purification of water containing trace low-molecular-weight organic pollutants in municipal high-standard water supply, large-scale high-end industrial production, municipal sewage advanced treatment and large-flow brackish water desalination. The accurate MWCO design perfectly combines ultra-large-spec low-flux high-load operation, high-precision deep purification and massive processing capacity, ensures the strictest high-standard and consistent effluent water quality, and meets the differentiated ultra-large-capacity high-precision water quality requirements of various industrial, municipal and environmental protection application scenarios.

The core filtration membrane of the RCP400-20EPP is a heavy-duty multi-layer composite enhanced EPP membrane with a total thickness of 190 μm, scientifically composed of three functional layers that are exclusively optimized for its 400 ultra-large-spec, 20 L/m²·h ultra-stable low flux and heavy-duty long-term high-precision operation: a 38 μm ultra-dense selective separation layer (the core functional layer for high-precision deep filtration and high salt rejection, made of high-purity high-strength EPP material with advanced nanoscale precision pore-forming and cross-linking technology, ensuring uncompromised ultra-high purification performance under long-term low-flux high-load operation and massive water passing volume); a 122 μm high-strength porous support layer (providing super strong mechanical support and pressure resistance for the membrane under ultra-large-spec, low-flux and large-flow working conditions, adopting a reinforced cross-linked polypropylene structure with optimized porosity and pore size distribution to avoid membrane deformation and damage caused by long-term water flow impact and high-load operation); and a 30 μm anti-fouling protective layer (modified with special hydrophilic and anti-adhesion heavy-duty nanotechnology, reducing membrane surface pollution and mechanical wear by more than 40%, and inhibiting the adsorption of organic pollutants, microorganisms, colloids and trace impurities to slow down fouling rate under low-flux large-flow high-precision operation). The three-layer thickness and material optimization design, combined with heavy-duty high-density molding technology, ensure the membrane’s long-term structural stability, ultra-high purification efficiency and anti-load performance while maintaining excellent water permeability and ultra-stable low flux, which is the core key to realizing the perfect balance between ultra-large processing capacity, high-precision deep purification and long service life of the product.

Under standard operating conditions and strict adherence to the regular maintenance and deep cleaning schedule, the recommended replacement cycle of the RCP400-20EPP is 40-52 months—an ultra-extended service life specially designed for its 400 ultra-large-spec, 20 L/m²·h ultra-stable low flux and heavy-duty ultra-large-capacity high-precision operating scenarios, far longer than conventional small, medium and general large-spec EPP membrane filtration products. The actual replacement cycle can be flexibly adjusted according to the actual inlet water quality and operating frequency: for raw water with ultra-low impurity content, low salinity and regular professional deep cleaning (1 time per quarter), the replacement cycle can be extended to 52 months; for raw water with moderate impurity content and 24-hour continuous high-load operation, the recommended replacement cycle is 40 months to ensure the stable operation of ultra-high filtration precision, ultra-stable flux and salt rejection performance; for raw water with relatively high impurity content (such as municipal sewage effluent), the cycle can be appropriately shortened to 36-40 months based on real-time detection data of water quality and operating parameters. The main quantitative indicators for replacement include a significant decrease in flux (≥10%), a sharp rise in pressure drop (≥0.04 MPa) or a noticeable decline in salt rejection rate (≥0.25%); the product’s heavy-duty modular integrated design makes the replacement process simple and fast, requiring no professional special tools, and a small operating team can complete the entire replacement operation within 60 minutes, minimizing the downtime of the ultra-large-capacity high-precision water treatment system and ensuring the continuous operation of municipal centralized water supply and large-scale industrial production.

The RCP400-20EPP has a number of outstanding core features that make it a leading choice in the ultra-large-spec low-flux high-precision water treatment market, combining advanced enhanced EPP membrane technology with heavy-duty 400 ultra-large-spec structural design for professional 20 L/m²·h ultra-stable low flux and ultra-large-capacity high-precision deep water purification scenarios. 1. 400 ultra-large-spec filtration area & 20 L/m²·h ultra-stable low flux dual optimization: Realizes the perfect balance between massive water processing capacity and ultra-stable low flux, breaking the traditional trade-off between ultra-large capacity, filtration precision and membrane service life of large-spec filtration products, and meeting the ultra-large-volume high-precision water demand of large-scale projects that prioritize effluent quality and long-term stability. 2. Food & industrial dual-certified heavy-duty EPP membrane material: Adopts food-grade and industrial-grade dual-certified enhanced EPP membrane materials with heavy-duty high-density molding technology, non-toxic, odorless, free of heavy metal leaching, organic matter precipitation and trace impurity release, no secondary pollution to water quality, and has excellent anti-load, anti-fouling, chemical resistance and low-flux stable performance, fully meeting the strictest safety, purity and long-term operation requirements of municipal high-standard drinking water supply, high-end industrial production and food and beverage processing. 3. Excellent ultra-stable salt rejection & calibrated MWCO performance: 99.0% monovalent and 99.6% divalent salt rejection rate, combined with 700 Da accurately calibrated MWCO, ensures the strictest high-standard and consistent effluent water quality and stable selective interception of trace micro-impurities, meeting the ultra-pure water requirements of various ultra-large-capacity municipal, industrial and environmental protection scenarios with strict purity demands. 4. Ultra-low pressure drop & super energy efficiency for ultra-large-spec low-flux operation: The 0.06-0.10 MPa ultra-low operating pressure drop under 20 L/m²·h low flux and ultra-large-capacity high-precision operation significantly reduces the energy consumption of the system’s water delivery and booster equipment, realizing ultra-energy-saving and environmentally friendly operation of ultra-large-capacity high-precision water treatment systems and effectively cutting down users’ long-term operational costs by more than 30%. 5. Superior heavy-duty structural stability & ultra-broad water quality adaptability: The reinforced heavy-duty engineering plastic housing and high-strength EPP membrane material enable stable operation under a wide working pressure range of 0.4-1.5 MPa, resistant to short-term pressure fluctuations and massive water flow impact without membrane deformation and structural damage; with an ultra-wide pH adaptation range of 2-11, it can adapt to the treatment of surface water, groundwater, tap water, industrial secondary water and municipal sewage effluent with different quality characteristics after simple 5 μm pre-filtration. 6. Heavy-duty modular design & flexible on-demand expansion: Extra-expanded ultra-large filtration area design meets the massive high-precision water demand of large-scale projects; multiple units can be connected in parallel or series to realize flexible expansion of system processing capacity and purification precision, adapting to different scale requirements of various water treatment projects from large to super large without changing the core pipeline layout, and the modular structure is easy for centralized intelligent management and maintenance. 7. Enhanced anti-fouling performance & ultra-extended service life: Membrane surface hydrophilic and anti-adhesion heavy-duty nanomodification technology reduces pollutant adsorption by more than 40%, and optimized low-resistance multi-channel laminar flow design slows down membrane fouling rate under low-flux large-flow high-precision operation; the 40-52 months ultra-extended replacement cycle effectively reduces the system’s maintenance and replacement costs, and improves the overall operation efficiency and economic benefits of the ultra-large-capacity high-precision water treatment system. 8. Heavy-duty integrated modular structure & easy maintenance: The whole machine adopts an integrated heavy-duty modular design that matches industrial large-diameter pressure pipeline accessories, with integrated high-sealing technology to avoid water leakage; disassembly, online CIP cleaning and core replacement processes are simple and fast, and regular daily maintenance does not require professional technical personnel, greatly reducing the labor cost and maintenance difficulty of system operation and maintenance. 9. Massive processing capacity & high effluent quality consistency: The 400 ultra-large-spec filtration area ensures massive water processing capacity to meet the ultra-large-volume water demand of municipal centralized supply and large-scale industrial production, while the ultra-stable low flux design guarantees the high consistency of effluent quality, avoiding quality fluctuations caused by flux changes.

Benefiting from its core advantages of 400 ultra-large-spec filtration area, 20 L/m²·h ultra-stable low flux, ultra-high precision, heavy-duty stable performance and ultra-broad adaptability, the RCP400-20EPP is widely applicable to various ultra-large-capacity municipal, industrial, food and beverage and environmental protection water treatment fields that require both massive water volume output and the strictest purification quality and long-term operational stability. In the municipal high-standard water supply field, it is the core filtration product for municipal tap water deep purification and advanced treatment in large and medium-sized cities, new central urban areas and municipal central water supply plants with massive water demand, improving municipal drinking water quality to meet the strictest international high-standard drinking water requirements, and ensuring the safe and high-quality water supply for millions of urban residents. In the high-end large-scale industrial field, it is the core filtration equipment for large-scale ultra-pure water preparation in electronic chip manufacturing bases, semiconductor component production clusters, pharmaceutical GMP production bases and new energy material manufacturing plants, realizing large-scale high-precision industrial process water supply and meeting the extreme purity demands of high-end industrial production. In the food and beverage deep processing field, it is applied to large-scale pure water and purified water preparation in large food processing enterprises, beverage production bases and dairy product manufacturing plants, adopting food-grade EPP membrane material to ensure the safety and purity of production water, and meeting the strict food safety standards and quality requirements. In the environmental protection advanced treatment field, it is the core product for large-scale municipal sewage advanced treatment and resource reuse, large-flow industrial wastewater deep purification and desalination treatment, and large-scale brackish water desalination in coastal and arid saline-alkali areas, realizing the efficient utilization of water resources and the high-level improvement of regional water ecological environment, and meeting the national environmental protection emission and water resource reuse standards. In addition, this model is also suitable for the ultra-large-capacity high-precision water treatment of centralized water supply systems in large high-tech industrial parks, large logistics parks and commercial complexes, as well as the process water preparation in aerospace, nuclear energy and marine engineering bases with massive water volume demand, ultra-high pure water requirements and harsh working conditions.

In summary, the RCP400-20EPP is a heavy-duty 400 ultra-large-specification, high-performance and multi-scenario applicable water treatment filtration product that integrates advanced enhanced EPP membrane technology, optimized 20 L/m²·h ultra-stable low flux design and heavy-duty ultra-large-spec structural design for ultra-large-capacity high-precision deep water purification scenarios. As the ultra-large-spec low-flux flagship model of the EPP membrane series, it breaks the long-standing performance limit between ultra-large processing capacity, high-precision deep purification and membrane service life of polypropylene membrane products, realizing a 400 ultra-large filtration area, 20 L/m²·h ultra-stable low flux, 0.005 micron ultra-high filtration precision, 99.6% divalent salt rejection rate and 700 Da calibrated MWCO while maintaining an ultra-low pressure drop of 0.06-0.10 MPa under low-flux ultra-large-capacity operation. Its outstanding advantages including 400 ultra-large-capacity and ultra-stable low flux dual optimization, excellent ultra-stable salt rejection performance, super energy efficiency for ultra-large-spec low-flux operation, superior heavy-duty structural stability, ultra-broad water quality adaptability, flexible modular configuration, ultra-extended service life and easy installation and maintenance not only ensure the strictest high-standard and consistent effluent quality for ultra-large-capacity high-precision water treatment projects, but also effectively reduce the overall operation, maintenance and energy consumption costs of the system by more than 30%. The product’s 400 ultra-large-spec design and 20 L/m²·h ultra-stable low flux perfectly meet the massive high-precision water demand of municipal high-standard centralized water supply, high-end large-scale industrial production, food and beverage deep processing and environmental protection advanced treatment that prioritize effluent quality and long-term operational stability, and its excellent compatibility with various mainstream high-precision water treatment processes (RO, EDI, UF, UV disinfection, ozone oxidation, ion exchange) makes it a versatile, high-reliability and irreplaceable core filtration component for ultra-large-capacity high-precision water treatment systems. Whether it is for municipal high-standard drinking water deep preparation in large cities, large-scale ultra-pure water production in high-end industrial bases, large-flow municipal sewage advanced treatment and resource reuse, or large-scale brackish water desalination in special areas, the RCP400-20EPP can provide a customized, efficient and reliable one-stop ultra-large-capacity high-precision deep filtration solution. Adhering to the design concept of ultra-large capacity, ultra-high precision, ultra-stability and long durability, this product can help users optimize ultra-large-capacity high-precision water treatment processes, improve water resource utilization efficiency on a massive scale, reduce environmental protection investment and operational costs, and realize the sustainable development of water treatment projects, making it an ideal core filtration choice for various ultra-large-capacity high-precision deep water treatment application scenarios.

The RCP400-20EPP is the 400 ultra-large-specification 20 L/m²·h ultra-stable low flux flagship model in the professional enhanced EPP membrane water treatment series, and the matching related products cover core filtration series models, special heavy-duty low-flux pre-filtration protection, professional deep cleaning agents, high-precision intelligent control systems and customized heavy-duty installation accessories, fully meeting the differentiated ultra-large-capacity high-precision water treatment needs of different users and various large-scale application scenarios. For the same series core filtration products, there are four complementary models to meet different large-scale project demands: RCP300-20EPP (large-specification 20 L/m²·h ultra-stable low flux model with reduced filtration area, suitable for large-scale high-precision water treatment projects such as prefecture-level municipal water supply plants, medium-sized high-end industrial production bases and large food processing enterprises with daily water demand of 1000-2000 tons); RCP500-20EPP (super-large-specification 20 L/m²·h ultra-stable low flux model with expanded filtration area, designed for super large-scale high-precision water treatment projects such as municipal central water supply plants in megacities, national-level high-tech industrial parks and coastal large-scale brackish water desalination projects with daily water demand ≥3000 tons); RCP400-30EPP (400 ultra-large-specification medium-flux model with 30 L/m²·h pure water flux, suitable for ultra-large-capacity water treatment projects with balanced requirements for effluent quality and processing efficiency); RCP400-40EPP (400 ultra-large-specification medium-high flux model with 40 L/m²·h pure water flux, suitable for ultra-large-capacity water treatment projects with higher processing efficiency requirements and moderate purity demands). In terms of matching pre-filtration products, the RCP-PRE19 EPP Heavy-Duty Low-Flux Special Pre-Filter is specially designed for the 400 ultra-large-spec low-flux EPP series, with a 5 μm ultra-fine coarse filtration precision and a heavy-duty large-flow low-resistance water channel design optimized for 20 L/m²·h ultra-stable low flux operation, which can effectively remove fine particle impurities, sand, colloid, suspended solids and large granular organic matter in raw water, avoid membrane fouling and damage caused by fine particles under low-flux large-flow high-precision operation, and extend the service life of the 400 ultra-large-spec EPP membrane core by 35-40%. For professional cleaning products, the RCP-CLE19 EPP Heavy-Duty Low-Flux Membrane Special Deep Cleaning Agent is a three-component high-efficiency cleaning agent (acidic + alkaline + enzymatic) specially formulated for the pollution characteristics of EPP membranes under 400 ultra-large-spec low-flux operation and complex raw water quality conditions (such as municipal sewage effluent), which can quickly and effectively remove organic fouling, scale, microbial slime, trace organic deposits and heavy metal ion impurities on the membrane surface without damaging the ultra-dense separation layer, restore the filtration flux and salt rejection performance of the EPP membrane to more than 99% of the original state, and reduce the frequency of core replacement. In terms of intelligent control accessories, the RCP-CONT19 Ultra-Large-Spec EPP Low-Flux Intelligent Operation and Monitoring Unit is perfectly matched with the 400 ultra-large-spec low-flux EPP series, which can realize real-time and high-precision monitoring of key operating parameters (flux, pressure drop, inlet/outlet water salinity, TDS, turbidity, temperature, water flow, dissolved oxygen, etc.) for single or multiple parallel units with millisecond-level response, and support automatic alarm, automatic low-pressure backwashing, intelligent CIP cleaning reminder and remote data transmission, greatly improving the automation level and operational stability of ultra-large-capacity high-precision water treatment systems and reducing manual operation and maintenance costs by more than 45%. In addition, the key supporting accessories also include two exclusive heavy-duty products for 400 ultra-large-spec low-flux high-precision operation: RCP-ACC18 Ultra-Large-Spec EPP Heavy-Duty Low-Flux Installation Accessory Kit (providing heavy-duty high-pressure anti-leakage connectors, food-grade/industrial-grade anti-aging gaskets, reinforced fixed brackets and pressure-resistant sealing parts that are resistant to massive water flow impact and trace impurity release, supporting quick installation with industrial large-diameter pressure pipelines and ensuring connection airtightness to avoid secondary pollution and pressure loss under low-flux large-flow high-precision operation) and RCP-BR17 Low-Pressure EPP Heavy-Duty Low-Flux Membrane Backwashing Pump (special matching accessory for 400 ultra-large-spec low-flux EPP filtration products, realizing efficient low-pressure reverse backwashing of the membrane core with adjustable pressure and large backwashing flow, further reducing membrane fouling under low-flux large-flow high-precision operation, restoring membrane permeability to the greatest extent, and extending the service life of the EPP membrane core by an additional 30-35% without damaging the ultra-dense separation layer). The RCP-MON16 Ultra-Large-Spec EPP Low-Flux Ultra-High Precision Water Quality Analyzer is a top-tier matching accessory for the RCP-CONT19 unit, which can realize real-time and accurate detection of multi-dimensional water quality parameters (TDS, conductivity, pH, ORP, dissolved oxygen, turbidity, trace ions, water flow, etc.) with a wide detection range and 0.001-level high precision, and transmit data to the intelligent control unit in real time, realizing closed-loop high-precision monitoring and intelligent control of the entire ultra-large-capacity low-flux high-precision water treatment system.