NSF Certification
NSF (National Sanitation Foundation) is an independent non-profit organization dedicated to setting standards, testing products, and certifying in the fields of public health, safety, and environmental protection.
The main NSF/ANSI standards include:
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Standard Number
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Standard Name and Focus
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Example Product Types
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NSF/ANSI 58
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Reverse Osmosis (RO) Drinking Water Treatment Systems: Specifically for reverse osmosis systems, covering contaminant removal rates, system efficiency (wastewater ratio), structural integrity, etc.
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Home Reverse Osmosis Water Purifiers
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NSF/ANSI 42
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Drinking Water Treatment Devices - Sensory Effects: Focuses on improving the taste, smell, and appearance of water, such as removing chlorine, particles, etc.
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Activated Carbon Filters, Pre-filters for improving tap water taste
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NSF/ANSI 53
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Drinking Water Treatment Devices - Health Effects: Focuses on removing harmful contaminants, such as lead, mercury, VOCs (volatile organic compounds), cysts, etc.
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Ultrafiltration Water Purifiers, some multi-stage filtration devices
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NSF/ANSI 401
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Drinking Water Treatment Devices - Emerging Contaminants/Incidental Pollutants: Focuses on removing trace emerging contaminants in water, such as certain drug residues, pesticides, herbicides, etc.
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Some water purifiers using special adsorption technologies
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NSF/ANSI 44
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Cation Exchange Water Softening Systems: For softening water by reducing calcium and magnesium ions (i.e., water hardness) using cation exchange resins
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Home Central Water Softener
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NSF/ANSI 55
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Ultraviolet (UV) Microbial Water Treatment Systems: For water disinfection using ultraviolet light, classified into Class A (disinfection) and Class B (bacteria reduction)
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UV Sterilizers
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NSF/ANSI 61
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Drinking Water System Components - Health Effects: This is not a whole system standard but evaluates the safety of materials used in all water-contact components (such as filter housings, pipes, faucets) to ensure no harmful substances leach into the water.
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Plastic components, metal parts, sealing materials in water purifiers
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NSF/ANSI 372
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Drinking Water System Components - Lead Content: Specifies the maximum allowable lead content in components that come into contact with water.
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Faucets, connectors, metal components of water purifiers
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The core standard for the Purifighter YHD2301A reverse osmosis water purifier is NSF/ANSI 58 (performance of reverse osmosis systems).
NSF/ANSI 58: Reverse Osmosis Drinking Water Treatment Systems
This standard evaluates and certifies the ability of reverse osmosis systems to reduce specific health-related contaminants in water, while also ensuring the structural integrity and safety of the entire system.
Key Certification Items and Requirements:
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Certification Item
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Specific Content and Requirements
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Significance for Consumers
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Contaminant Removal Claims
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The standard strictly defines the contaminants that an RO system can claim to remove and the minimum removal rates. For example: Lead, Arsenic, Cadmium, Chromium, Selenium: Removal rate ≥ 85%; Nitrates/Nitrites: Removal rate ≥ 75%; Total Dissolved Solids (TDS): Removal rate ≥ 75%; Cysts (e.g., Giardia, Cryptosporidium): Removal rate ≥ 99.95%; Asbestos (above 1 μm): Removal rate ≥ 99.95%.
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Ensures the RO system effectively removes the harmful substances it claims to remove, providing consumers with truly safe and pure water. The performance data is verifiable, not just marketing claims.
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System Recovery Rate (Wastewater Ratio)
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The recovery rate (i.e., the amount of pure water produced relative to the total input water) is tested and certified. This is a performance indicator and not a mandatory requirement, but it must be accurately labeled.
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Helps consumers understand the water-saving efficiency of the product. The higher the recovery rate (lower wastewater ratio), the more water-efficient the product is, which is a key consideration for many buyers.
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Total Dissolved Solids (TDS) Removal Rate
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Requires the system to maintain a TDS removal rate of at least 75%. This is a separate test from the contaminant removal rate.
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Ensures the RO membrane maintains effective performance. Consumers can intuitively check if the machine is functioning properly via the TDS monitoring feature on the product (e.g., IN/OUT ppm display).
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Structural Integrity
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Tests the system’s durability under working pressure and water hammer effects to ensure no leaks or bursts.
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Ensures the safety and reliability of the product under long-term use and varying water pressures, preventing water damage in the home.
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Material Safety (NSF/ANSI 61)
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All water-contacting parts (e.g., filter housings, pipes, faucets, inner membranes of storage tanks) must meet the NSF/ANSI 61 (Drinking Water System Components - Health Effects) standard to ensure no harmful substances leach into the water.
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Ensures that the machine itself will not become a source of secondary contamination. This is the basic guarantee for safety.
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Product Information and Labeling
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Clear and accurate labeling and instructions are required.
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Protects consumers’ right to know, ensuring they receive correct installation, use, and maintenance information.
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Summary of NSF/ANSI 58:
It is not just a "good filtration" certificate, but a comprehensive certification for the performance, safety, and integrity of the entire system. It assures consumers that the RO system has been rigorously tested by third parties for everything from "material safety" to "filtration performance" to "structural durability."
NSF/ANSI 42: Drinking Water Treatment Devices - Sensory Effects
This standard mainly focuses on the “taste, smell, and appearance” of water, improving the drinking experience.
Core Purpose:
To certify the ability of the device to reduce specific contaminants that cause sensory issues in water, such as chlorine, chloramine, and particles (e.g., sand, rust).
Key Certification Items and Requirements:
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Certification Item
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Specific Content and Requirements
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Significance for Consumers
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Contaminant Removal Claims
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Focuses on contaminants affecting sensory aspects: Chlorine: Effectively reduces residual chlorine. Chloramine: Some certified products can remove it. Particles (Class I - VI): Effectively reduces suspended particles, such as sand, rust.
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Water treated with this filter will have no unpleasant chlorine or bleach smell and will look clearer. This greatly improves the taste and appearance of drinking water.
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Material Safety (NSF/ANSI 61)
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All water-contacting parts must meet NSF/ANSI 61 material safety standards.
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Ensures the safety of the product, as with NSF/ANSI 58.
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Structural Integrity
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Requires pressure testing, similar to NSF/ANSI 58.
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Ensures basic structural safety.
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Summary of NSF/ANSI 42:
It certifies that a water purifier can make water taste better and look clearer. Typically, activated carbon filters are the main technology used to achieve this certification.
Our Purifighter YHD2301A reverse osmosis water purifier uses a core filter element, the original DuPont (DOW FilmTec™) RO membrane, which has passed the NSF/ANSI 58 standard and can effectively remove up to 99% of harmful substances such as heavy metals, viruses, bacteria, and pesticide residues, ensuring safe drinking water.
At the same time, our pre-filter composite filter (PP cotton + activated carbon) effectively filters large particles such as sand and rust and significantly reduces residual chlorine, improving the taste and smell of water. Its performance meets the NSF/ANSI 42 standard.
All water-contacting components of the system are made of food-grade materials and meet the NSF/ANSI 61 material safety standard, preventing secondary contamination.
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NSF/ANSI 42 cares about “taste and odor.”
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NSF/ANSI 58 cares about “safety and health.”
We promise that every filtration claim can withstand the most rigorous international standards, providing you with truly safe, delicious drinking water.
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