This 1μm PP wound filter cartridge is a high-precision professional filtration component custom-engineered for the front-end protection of ultrafiltration (UF) and nanofiltration (NF) membrane equipment, serving as a critical pre-filtration barrier in advanced water treatment systems. Crafted from 100% high-purity polypropylene (PP) resin via an ultra-precise spiral winding process on a reinforced rigid PP inner support core, it features an adhesive-free integral forming structure and a dense, uniform graded filtration layer tailored for 1μm precision interception. Its core function is to remove submicron and fine particulate impurities from the feed water before it enters UF/NF membrane systems, effectively preventing membrane surface scratching, pore blockage and irreversible fouling caused by fine solids—thus extending the service life of high-value UF/NF membranes, reducing membrane cleaning frequency and ensuring the stable, efficient operation of advanced water treatment systems. Compatible with standard 10/20/30/40-inch filter housings widely used in water treatment, it complies with industrial water treatment material standards, contains no toxic additives and causes no secondary pollution to feed water, making it an indispensable front-end protection precision filter cartridge for UF/NF equipment in municipal, industrial and commercial water treatment scenarios.

This filter cartridge is engineered with a fixed 1μm absolute filtration precision, a core design tailored for the strict pre-filtration requirements of UF and NF membrane equipment. The ultra-precise winding process and uniform pore size distribution of the PP filtration layer ensure that over 99% of solid particulate impurities with a particle size of 1μm and above are efficiently intercepted, including fine silt, clay particles, colloidal solids, rust microparticles, suspended solids (SS) and tiny mechanical impurities in the feed water. Unlike nominal precision filter cartridges, its absolute 1μm precision guarantees consistent, reliable interception of fine contaminants without precision deviation in different operating conditions, which is critical for protecting the delicate membrane pores of UF/NF equipment and avoiding membrane fouling caused by submicron impurities that cannot be intercepted by conventional pre-filters. This fixed high precision perfectly matches the front-end protection demand of UF/NF systems, striking a scientific balance between fine impurity removal and feed water flux supply.

Under the standard industrial operating conditions of 25℃ ambient temperature and 0.2MPa inlet pressure, the nominal flux of this 1μm PP wound filter cartridge is calibrated by its physical specification to meet the feed water demand of UF/NF systems with different processing capacities: the 10-inch model achieves 5-8 L/min, 20-inch model 10-15 L/min, 30-inch model 20-28 L/min and 40-inch model 35-45 L/min. As a high-precision filter cartridge with 1μm absolute filtration, its flux is moderately designed to prioritize impurity interception efficiency while ensuring sufficient and stable feed water supply for UF/NF membrane systems. The optimized internal flow channel structure and uniform filtration layer density minimize water flow resistance under high precision, avoiding excessive flux loss that would lead to insufficient feed water for UF/NF equipment. For multi-core filter housing configurations, the total flux can be linearly scaled up by increasing the number of cartridges, which is adaptable to the large-flow feed water demands of industrial-scale UF/NF water treatment systems.

As a physical precision filtration component dedicated to particulate impurity interception for UF/NF front-end protection, this 1μm PP wound filter cartridge is designed only for particle size-based removal of insoluble solid contaminants and has no ion separation, desalination or salt rejection functional design. Therefore, it has no salt rejection rate index. All dissolved inorganic salts, metal ions, small molecule soluble substances and mineral components in the feed water can pass through the cartridge body smoothly and enter the subsequent UF/NF membrane systems, where the professional salt and molecular weight rejection process is completed by the UF/NF membranes. This functional positioning is highly consistent with the core role of UF/NF front-end pre-filtration—focusing on removing fine particulates that damage membranes without interfering with the ion separation and solute rejection functions of the subsequent advanced membrane systems, and ensuring the normal operation of the UF/NF desalination and purification process.

The initial pressure drop of a new 1μm PP wound filter cartridge under the standard nominal flux and 25℃ operating temperature is ≤0.03MPa for all specifications, a low pressure loss design optimized for high-precision filtration. This initial pressure drop is far lower than the pressure drop limit of UF/NF pre-filtration systems, ensuring minimal feed water pressure loss in the front-end protection link and reducing the energy consumption of feed water booster pumps. With the continuous operation of the water treatment system, fine 1μm and above impurities are continuously intercepted and accumulated on the surface and inside of the dense filtration layer, leading to a gradual rise in pressure drop. The recommended maximum operating pressure drop of this cartridge is 0.1MPa for all specifications; when the pressure drop reaches this value, the cartridge must be replaced immediately. Delayed replacement will cause excessive feed water pressure loss, reduce the water production rate of UF/NF systems, increase pump energy consumption and even lead to membrane fouling due to the backflow of accumulated impurities caused by high pressure difference.

This 1μm PP wound filter cartridge adopts a pure physical filtration mechanism based on particle size interception, whose core working principle is to capture solid particulate impurities according to their actual physical size rather than separating substances based on molecular weight or molecular size—this is fundamentally different from UF/NF membranes that are designed with specific Molecular Weight Cutoff (MWCO) indexes. Therefore, this filter cartridge has no specific MWCO index. Its interception effect is only targeted at insoluble solid particulates with a particle size of 1μm and above; macromolecular organic substances, soluble colloids and other dissolved substances in the feed water can pass through the cartridge body smoothly as long as their actual particle size is smaller than 1μm, and then enter the subsequent UF/NF systems for professional molecular weight-based separation and purification. This design fully meets the front-end protection demand of UF/NF equipment, which only requires the removal of physical particulate impurities without molecular weight-based substance separation.

The effective PP filtration layer thickness of this 1μm precision wound filter cartridge is specially optimized for high-precision interception and front-end protection, with thickness calibrated by its specification: the 10-inch model features a filtration layer of 7-10mm, 20-inch model 9-13mm, 30-inch model 12-16mm and 40-inch model 15-20mm. The total outer diameter of all specifications is the industry standard 63mm/70mm, perfectly matching the internal size of standard filter housings for UF/NF pre-filtration systems. The moderately thickened, dense effective filtration layer is the key to ensuring 1μm absolute filtration precision, which not only provides a sufficient impurity holding capacity to delay the rise of pressure drop under high-precision filtration conditions, but also forms a multi-layer compact interception structure to prevent fine 1μm impurities from passing through the filtration layer. The inner support core is made of reinforced rigid PP material with a thickness of 3-5mm (matching the cartridge specification), featuring high pressure resistance and structural stability to avoid filtration layer deformation and precision loss under the operating pressure of 0.6MPa—thus ensuring consistent 1μm interception precision throughout the service life of the cartridge.

The recommended standard replacement cycle of this 1μm PP wound filter cartridge is determined by its specification and the feed water quality of UF/NF systems: for 10/20-inch models used in small and medium-sized UF/NF equipment (commercial water treatment, small industrial systems) with feed water turbidity ≤5 NTU and suspended solids (SS) ≤10 mg/L, the standard cycle is 1-2 months; for 30/40-inch models applied in large-scale industrial UF/NF water treatment systems (municipal water reuse, industrial pure water production) with feed water turbidity ≤8 NTU and SS ≤15 mg/L, the standard cycle is 2-3 months. The actual replacement cycle is highly dependent on the feed water quality: for feed water with high turbidity (NTU＞8) and high SS content (SS＞15 mg/L), the cycle is shortened to 2-4 weeks; for feed water with ultra-clean pre-treatment (turbidity ≤3 NTU, SS ≤5 mg/L), the cycle can be appropriately extended by 1-2 weeks. In strict accordance with the operation requirements of UF/NF systems, the cartridge must be replaced immediately once the system pressure drop reaches 0.1MPa, regardless of the actual use time—this is to avoid membrane fouling and damage caused by accumulated fine impurities, which is far more costly to remedy than regular filter cartridge replacement.

This 1μm PP wound filter cartridge has a number of professional performance features adapted to the front-end protection demand of UF/NF membrane equipment: 1. 1μm absolute filtration precision: Ultra-precise winding process and uniform pore size distribution ensure 99%+ interception of 1μm and above fine impurities, providing a reliable pre-filtration barrier for UF/NF membranes and avoiding membrane scratching and fouling; 2. 100% high-purity PP raw material: Adopts food-grade and industrial-grade dual-standard high-purity PP resin, acid and alkali resistant (adapts to feed water pH 1-13), corrosion resistant to common water treatment chemicals, with excellent chemical stability and no harmful substance dissolution; 3. Adhesive-free integral forming: No adhesives, binders or glues are used in production, avoiding the dissolution of organic solvents into feed water and secondary pollution, while ensuring structural firmness and no delamination under high-precision filtration and pressure fluctuation; 4. Reinforced pressure-resistant structure: Reinforced rigid PP inner support core with high structural stability, can withstand 0.6MPa operating pressure without deformation or rupture, ensuring no precision loss of the filtration layer in UF/NF system operation; 5. Optimized flux with low initial pressure drop: Scientific flow channel design and uniform filtration layer density minimize pressure loss under 1μm high precision, ensuring stable feed water flux for UF/NF equipment and reducing booster pump energy consumption; 6. Dense graded filtration layer: Moderately thickened filtration layer forms a multi-layer compact interception structure, with sufficient impurity holding capacity to delay pressure drop rise and reduce replacement frequency under high-precision filtration conditions; 7. Standard industrial compatibility: Matches all industry standard 10/20/30/40-inch filter housings (PP plastic/304/316 stainless steel), with unified installation specifications, easy disassembly and replacement, no need for professional tools, suitable for quick maintenance of UF/NF systems; 8. Non-toxic and eco-friendly: The whole cartridge is made of single PP material, free of heavy metals and toxic additives, easy to recycle and harmless disposal, in line with the green environmental protection requirements of advanced water treatment industry.

This 1μm PP wound filter cartridge is a dedicated precision pre-filtration component for the front-end protection of UF and NF membrane equipment, and its core application fields cover all advanced water treatment scenarios equipped with UF/NF systems that require fine particulate impurity removal for membrane protection: 1. Industrial pure water/ultrapure water production: Applied to the front-end pre-filtration of UF/NF membrane systems in electronics, semiconductor, pharmaceutical and chemical industries, protecting membranes from fine impurities in raw water and ensuring the production of high-purity water; 2. Municipal water reuse and wastewater treatment: Used in the front-end protection of UF/NF systems in municipal sewage reclamation, industrial wastewater reuse and zero-discharge projects, removing fine particulates in wastewater and preventing membrane fouling in sewage treatment; 3. Drinking water deep purification: Applied to the pre-filtration of UF/NF membrane systems in municipal drinking water deep treatment, community direct drinking water and bottled water production, removing fine colloids and particulates and protecting membranes while improving drinking water quality; 4. Seawater/brackish water desalination: Used in the front-end protection of UF/NF pre-treatment systems in seawater and brackish water desalination projects, removing fine silt and suspended solids in seawater/brackish water and reducing the fouling risk of subsequent RO/NF membranes; 5. Food and beverage industry water treatment: Applied to the pre-filtration of UF/NF membrane systems in food, beverage and dairy production, complying with food-grade material standards, protecting membranes and ensuring the safety of production water; 6. Biopharmaceutical water treatment: Used in the front-end protection of UF/NF membrane systems in biopharmaceutical and vaccine production, removing fine particulate impurities in purified water and WFI (Water for Injection) pre-treatment, meeting GMP pharmaceutical production standards; 7. Commercial advanced water treatment: Applied to the front-end pre-filtration of UF/NF equipment in commercial water purifiers, hotel central water purification and office building direct drinking water systems, protecting membranes and ensuring stable operation of small and medium-sized advanced water treatment systems.

In summary, this 1μm PP wound filter cartridge is a high-precision, professional front-end protection filter cartridge specially developed for ultrafiltration and nanofiltration membrane equipment, and is a critical core component to ensure the long-term, stable and efficient operation of advanced UF/NF water treatment systems. Its core design of 1μm absolute filtration precision fills the gap of fine impurity interception in the front-end pre-filtration of UF/NF systems, efficiently removing over 99% of fine particulate impurities with a particle size of 1μm and above from feed water—thus fundamentally preventing UF/NF membrane scratching, pore blockage and irreversible fouling, extending the service life of high-value UF/NF membranes by more than 50% and reducing membrane cleaning and replacement costs significantly. Crafted from 100% high-purity PP resin with an adhesive-free integral forming process, it ensures no secondary pollution to feed water and complies with industrial and food-grade water treatment material standards, adapting to the diverse feed water quality requirements of different water treatment scenarios. With the advantages of low initial pressure drop, optimized flux, reinforced pressure resistance and standard industrial compatibility, it is perfectly adapted to the operating characteristics of UF/NF systems, providing a reliable, low-energy and easy-to-maintain pre-filtration protection solution. Widely applicable to industrial pure water production, municipal water reuse, seawater desalination and drinking water deep purification, it is an indispensable front-end protection precision filter cartridge for all advanced water treatment systems equipped with UF/NF membrane equipment, and is the first choice for UF/NF pre-filtration with strict fine impurity removal requirements.

The matching related products of this 1μm PP wound filter cartridge are all core components and supporting equipment of UF/NF membrane water treatment systems, forming a complete advanced water treatment pre-filtration and membrane separation product system: 1. UF/NF membrane elements: The core protected components of this filter cartridge, including hollow fiber UF membranes, roll-type NF membranes of various specifications (4040, 8040, household small-size), matching different water treatment capacities and purification requirements; 2. Standard pre-filtration filter housings: 10/20/30/40-inch filter housings made of 304/316 stainless steel and food-grade PP plastic, the special supporting equipment for this cartridge, with single/multi-core designs and pressure gauge interfaces for real-time pressure drop monitoring; 3. Coarse pre-filtration filter cartridges: 5/10/20μm PP wound/melt-blown filter cartridges of the same specifications, used for primary coarse filtration before this 1μm precision filter cartridge, removing large particulate impurities and reducing the filtration load of the 1μm cartridge; 4. Water treatment chemicals: Including membrane antifoulants, scale inhibitors, flocculants and membrane cleaning agents, matching with this cartridge to optimize feed water quality, reduce membrane fouling and maintain the performance of UF/NF membranes; 5. Feed water booster and pressure stabilizing equipment: Including frequency conversion booster pumps, pressure stabilizing tanks and check valves, used with this cartridge to ensure stable feed water pressure and flux for UF/NF systems; 6. Water quality monitoring instruments: Including online turbidity meters, suspended solid (SS) detectors, pressure transmitters and flow meters, real-time monitoring of feed water quality and cartridge operating status, facilitating automatic alarm and timely replacement; 7. Filtration system accessories: Food-grade silicone gaskets, stainless steel quick connectors, high-pressure ball valves, filter cartridge pullers and drain valves, used for the installation, sealing and maintenance of this cartridge and filter housings, ensuring the tightness and safety of the pre-filtration system; 8. Same series precision PP filter cartridges: 0.45μm/5μm PP wound filter cartridges of the same specifications, replaceable according to the different fine impurity removal requirements of UF/NF feed water in different scenarios; 9. Integrated UF/NF water treatment equipment: Integrated advanced water treatment machines equipped with this 1μm pre-filtration cartridge and UF/NF membrane elements, providing turnkey water treatment solutions for small and medium-sized scenarios with compact structure and easy operation; 10. Backwashing systems: Including high-pressure backwash pumps, clean water tanks and backwash pipelines, used for the backwashing of pre-filtration filter housings and UF membrane elements, extending the service life of both the filter cartridge and membrane elements.