This food-grade PP wound filter cartridge is a professional water purification component exclusively engineered for the purification of drinking water, mineral water and bottled water, adhering to strict food safety and hygiene standards of the food and beverage industry. Crafted from 100% food-grade high-purity polypropylene (PP) resin as the core raw material, it is manufactured via a precision spiral winding process on a food-grade rigid PP inner support core, with an adhesive-free integral forming process throughout production. Designed for the core demand of removing harmful particulate impurities while retaining the beneficial mineral components of natural water, this filter cartridge forms a uniform, graded porous filtration structure that efficiently intercepts solid particulates in water without introducing any toxic or harmful substances, ensuring the safety, cleanliness and compliance of purified water with food-grade drinking standards. It is compatible with standard filter housings of various specifications (10/20/30/40-inch) widely used in the water purification industry, features easy installation and replacement, and is an essential core filtration component for drinking water, mineral water and bottled water production and purification systems, suitable for both industrial-scale production lines and commercial/household water purification equipment.

Tailored to the strict impurity removal requirements of drinking water, mineral water and bottled water purification, the filtration precision of this food-grade PP wound filter cartridge is available in food industry mainstream high-precision specifications of 1 μm, 5 μm, 10 μm and 20 μm, with 5 μm and 10 μm being the most commonly used standard specifications for drinking water purification. This precision range is scientifically designed to target the key harmful impurities in raw water for drinking and bottled water, including fine silt, clay particles, rust residues, suspended solids, colloidal particulates, and tiny mechanical impurities generated during water transportation and storage. The graded winding design ensures consistent and stable filtration precision across the entire cartridge body, realizing efficient and targeted interception of all harmful particulates larger than the set precision while allowing beneficial mineral ions and small molecule water to pass through smoothly, perfectly balancing impurity removal efficiency and the retention of natural mineral components of mineral water.

Under the standard food industry operating conditions of 25℃ ambient temperature and 0.2MPa inlet pressure, the nominal flux of this food-grade PP wound filter cartridge is matched to its specification, with the 10-inch model reaching 8-15 L/min, 20-inch model 15-25 L/min, 30-inch model 30-45 L/min and 40-inch model 60-80 L/min. For the same specification, the flux is slightly adjusted based on filtration precision: the 1 μm high-precision model has a slightly lower flux, while the 10 μm and 20 μm models feature a higher and more stable flux. The flux design is fully adapted to the diverse water flow demands of drinking water purification scenarios, from household and commercial small-flow water purifiers to large-scale industrial mineral water and bottled water production lines, ensuring sufficient and stable water supply while maintaining high-precision impurity removal efficiency, and avoiding the problem of low water production efficiency caused by excessive flux loss.

As a food-grade physical filtration component dedicated to particulate impurity interception in drinking water, mineral water and bottled water, this PP wound filter cartridge is not designed with ion separation, desalination or salt rejection functionality, and thus has no salt rejection rate index. Its core filtration principle is pure physical interception based on particle size; all dissolved inorganic salts, beneficial mineral ions (such as calcium, magnesium, potassium, sodium), and small molecule soluble substances in water can pass through the cartridge body smoothly. This functional positioning is highly consistent with the core demand of drinking water and mineral water purification—removing harmful solid particulates while retaining the natural mineral composition and taste of water, which is a key design feature distinguishing it from desalination filter elements such as RO membranes and ensuring the authentic mineral water taste and nutritional value of the purified water.

The initial pressure drop of a new food-grade PP wound filter cartridge under the standard nominal flux and 25℃ operating temperature is ≤0.02MPa for all specifications, which is far lower than the pressure drop limit of food and beverage industry water purification systems, ensuring minimal pressure loss of water in the filtration link and reducing the energy consumption of water supply pumps in production lines and water purifiers. With the continuous operation of the purification system, as fine particulates are intercepted and accumulated on the surface and inside of the cartridge body, the pressure drop will gradually rise. 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 in time to avoid excessive pressure loss in the water supply system, which will lead to reduced water production flow, increased energy consumption, and even the risk of secondary pollution caused by impurity accumulation and bacterial reproduction in the cartridge.

This food-grade PP wound filter cartridge adopts a particle size-based pure physical filtration mechanism, which is fundamentally different from membrane filtration components such as ultrafiltration, nanofiltration and reverse osmosis that separate substances according to molecular weight and molecular size. Therefore, it has no specific Molecular Weight Cutoff (MWCO) index. Its interception effect is only aimed at solid particulate impurities with particle sizes larger than its set filtration precision; macromolecular organic substances, natural colloids and other substances in water can pass through the cartridge body as long as their actual particle size is smaller than the filtration precision. This design fully meets the purification demand of drinking water, mineral water and bottled water—only removing harmful particulate impurities without changing the molecular composition of water, and avoiding the loss of beneficial macromolecular substances such as natural organic matter in mineral water.

The effective food-grade PP filtration layer thickness of this filter cartridge is optimized according to its specification, with the 10-inch model at 5-8mm, 20-inch model at 8-12mm, 30-inch model at 10-15mm and 40-inch model at 12-18mm. The total outer diameter of all specifications is the food industry standard 63mm/70mm, perfectly matching the internal size of standard food-grade filter housings of various specifications. The moderately thickened effective filtration layer, tailored for each specification, not only ensures a sufficient impurity holding capacity to delay the rise of pressure drop and reduce replacement frequency, but also forms a multi-layer stepped filtration structure to intercept different particle size impurities step by step, improving the overall purification efficiency and effect. The inner support core is made of food-grade rigid PP material with a thickness of 3-5mm (matching the specification), ensuring the structural stability of the cartridge body, no deformation or rupture under the operating pressure of 0.4MPa, and complying with the food safety and hygiene requirements of the water purification industry in all structural aspects.

The recommended replacement cycle of this food-grade PP wound filter cartridge is determined by its specification and application scenario: for household and commercial small-flow water purifiers (10/20-inch) with daily water output of 200-1000L, the standard replacement cycle is 1-3 months; for medium and large commercial water purification equipment (30-inch) with daily water output of 1-5 tons, the cycle is 2-4 months; for industrial-scale mineral water and bottled water production lines (40-inch) with continuous 24-hour operation, the standard cycle is 3-6 months. The actual replacement cycle is closely related to the raw water quality: for raw water with high turbidity (NTU＞5) and high suspended solid content, the cycle is shortened by 1-2 months; for raw water with low turbidity (NTU＜3) that has undergone preliminary pre-treatment, the cycle can be appropriately extended. In addition, in strict accordance with food safety standards, the cartridge must be replaced immediately once the pressure drop reaches 0.1MPa, regardless of the actual use time, to prevent bacterial reproduction and secondary pollution caused by long-term impurity accumulation, ensuring the absolute safety of drinking water, mineral water and bottled water.

This food-grade PP wound filter cartridge has a number of professional performance features adapted to the high standards of drinking water, mineral water and bottled water purification: 1. 100% food-grade raw material: Adopts food-grade high-purity PP resin that complies with FDA, EU LFGB and national food safety standards, free of heavy metals, plasticizers and toxic additives, acid and alkali resistant (adapt to water pH value 2-12), with excellent chemical stability and no harmful substance dissolution in water; 2. Adhesive-free integral forming: No adhesives, binders or glues are used in the entire production process, avoiding the dissolution of organic solvents and harmful substances into water, and ensuring the food safety and hygiene of purified water; 3. Precision graded filtration: Graded spiral winding structure realizes targeted interception of harmful impurities, retains beneficial mineral ions, and balances purification efficiency and water quality taste; 4. Food-grade structural design: The inner support core, filtration layer and end caps are all made of food-grade PP material, with no non-food-grade components in contact with water, complying with the whole-process food safety requirements; 5. Low initial pressure drop with stable flux: Optimized flow channel design and uniform winding process ensure ultra-low initial pressure drop and stable flux during operation, reducing energy consumption and ensuring continuous water supply; 6. Standard compatibility & easy maintenance: Matches all industry standard filter housings of 10/20/30/40-inch specifications, with unified installation size, easy disassembly and replacement, no need for professional tools, suitable for various purification scenarios; 7. High impurity holding capacity: Moderately thickened filtration layer and three-dimensional porous structure realize sufficient impurity storage, delaying pressure drop rise and reducing replacement frequency, saving operation and maintenance costs; 8. Environmental protection & safe disposal: The whole cartridge is made of single food-grade PP material, easy to recycle and harmless disposal, in line with the green and environmental protection requirements of the food and beverage industry, and no secondary pollution to the environment during disposal.

This food-grade PP wound filter cartridge is a dedicated purification component for drinking water, mineral water and bottled water, complying with strict food safety standards, and its core application fields cover all water purification scenarios that require food-grade safety and high-precision impurity removal: 1. Household drinking water purification: Installed in household kitchen water purifiers, under-sink water filters and central water purification systems, removing impurities in tap water to provide clean and safe direct drinking water for families; 2. Commercial drinking water equipment: Used in commercial water purifiers, water vending machines and drinking water fountains in shopping malls, office buildings, schools, hospitals and communities, ensuring the food safety of commercial drinking water for the public; 3. Bottled water production lines: Applied to the core filtration link of mineral water, purified water and natural spring water bottled water production lines in beverage factories, realizing high-precision impurity removal for large-flow raw water and ensuring the product quality of bottled water; 4. Bulk water supply systems: Used in the purification of bulk mineral water and drinking water supply systems in hotels, restaurants, catering chains and food processing factories, meeting the large-demand food-grade water use requirements of the catering and food industry; 5. Mineral water plant purification: As the core pre-filtration and fine filtration component of mineral water plants, intercepting impurities in natural mineral water raw water while retaining the natural mineral components and taste of mineral water; 6. Mobile water purification equipment: Installed in mobile drinking water purification vehicles and outdoor water purification equipment, suitable for emergency drinking water supply, field operations and rural drinking water improvement projects, providing food-grade safe drinking water; 7. Small beverage production: Applied to the water purification link of small beverage production (such as fruit juice, tea drinks, dairy products), ensuring the cleanliness of production water and improving the quality and taste of beverage products.

In summary, this food-grade PP wound filter cartridge is a high-performance, food safety-compliant professional water purification component specially developed for the purification of drinking water, mineral water and bottled water, and is an indispensable core filtration component in the food and beverage industry’s water purification system. Its design is fully tailored to the high standards and core demands of drinking water purification: adopting 100% food-grade high-purity PP raw materials and an adhesive-free integral forming process, complying with FDA, EU LFGB and national food safety standards, and ensuring no harmful substance dissolution and secondary pollution in the whole water contact process. The 1-20 μm high-precision graded filtration structure efficiently intercepts all harmful particulate impurities in water while retaining the beneficial mineral ions of mineral water, perfectly balancing impurity removal efficiency and the retention of natural water quality and taste. With the advantages of ultra-low initial pressure drop, stable flux, standard compatibility, easy installation and high impurity holding capacity, it is suitable for various purification scenarios from household small-flow water purifiers to industrial-scale bottled water production lines. It can effectively improve the cleanliness and safety of drinking water, mineral water and bottled water, ensure compliance with food-grade drinking standards, and at the same time reduce the operation and maintenance costs of purification systems, improve water production efficiency. As a professional food-grade water purification filter cartridge, it has irreplaceable important value in the drinking water and beverage industry, and is the first choice for the purification of drinking water, mineral water and bottled water with strict food safety requirements.

The matching related products of this food-grade PP wound filter cartridge are all core components and supporting equipment of food-grade drinking water, mineral water and bottled water purification systems, forming a complete food-grade water purification product system that complies with food safety standards: 1. Food-grade activated carbon filter cartridges (GAC/CTO): Including food-grade granular activated carbon and compressed activated carbon filter cartridges of 10/20/30/40-inch specifications, used in the subsequent link of this PP filter cartridge to remove residual chlorine, odor, color and organic matter in water, improving the taste of drinking water and mineral water; 2. Food-grade filter housings: Standard food-grade filter housings of 10/20/30/40-inch specifications made of food-grade PP plastic and 304/316 stainless steel, the special supporting equipment for this filter cartridge, complying with food safety standards and suitable for various purification scenarios; 3. Food-grade ultrafiltration (UF) membrane filter cartridges: Food-grade UF membrane filter cartridges of various specifications, used in the deep purification link of drinking water and bottled water after this PP filter cartridge, realizing the interception of bacteria, viruses and macromolecular colloids while retaining mineral ions; 4. Water quality testing instruments for food industry: Including turbidity meters, residual chlorine detectors, pH meters and suspended solid analyzers that comply with food industry standards, real-time monitoring of raw water and purified water quality, ensuring the compliance of drinking water, mineral water and bottled water; 5. Food-grade water purification accessories: Food-grade silicone gaskets, quick connectors, ball valves and pressure gauges made of food-grade materials, used for the installation and sealing of this filter cartridge and filter housings, with no non-food-grade components in contact with water; 6. Same series food-grade PP filter cartridges: Food-grade melt-blown PP filter cartridges of the same specifications, an alternative filtration component for this wound filter cartridge, with a more compact structure, suitable for drinking water purification with higher fine impurity removal requirements; 7. Industrial water purification equipment for beverage industry: Large-scale food-grade multi-media filters, precision filters and water softeners used in mineral water and bottled water production lines, matching with this filter cartridge to form a complete industrial pre-treatment and fine purification system; 8. Household/commercial water purification complete sets: Household under-sink water purifiers, commercial water vending machines and integrated water purification equipment equipped with this food-grade PP wound filter cartridge, providing turnkey food-grade drinking water purification solutions for different scenarios.