Composite Filter
Composite Filter
The composite filter integrates various filtering materials and processes into a single filter to achieve multiple filtration effects. Its core function can be summarized as pre-filtration and taste pre-treatment.
The composite filter plays the role of both a "pioneer" and a "guardian":
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Protects subsequent precision filters (especially the RO membrane): This is its most crucial role. The RO membrane is highly precise and expensive, and it can easily be blocked or scratched by large particles, rust, and sediments. The composite filter intercepts these impurities, greatly extending the life of the RO membrane and reducing the long-term costs for the user.
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Removes residual chlorine and chemical pollutants: Residual chlorine in tap water (used for disinfection) is the "enemy" of the RO membrane. It oxidizes and degrades the polyamide layer on the membrane, reducing the desalination rate and water output. The activated carbon in the composite filter efficiently absorbs residual chlorine, protecting the RO membrane.
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Improves water taste and odor: Activated carbon effectively absorbs undesirable tastes and odors (such as chlorine or earthy smells), making the filtered water taste sweeter and more suitable for direct drinking.
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Preliminary filtration of suspended solids and impurities: The filter removes visible and invisible large particles such as sand, rust, colloids, and parasites (e.g., Giardia, Cryptosporidium), enhancing water clarity.
Functional Parameters Breakdown
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Parameter Category
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Specific Parameter
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Meaning and Explanation
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Filtration Precision
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5 microns (μm)
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Refers to the smallest particle diameter that the filter can effectively intercept. A 5μm filter effectively removes most sediments and cysts (e.g., Giardia, Cryptosporidium). The smaller the precision, the more refined the filtration (e.g., 1μm).
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Water Treatment Capacity
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xxxx gallons (GAL) or xxxx liters (L)
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Represents the total amount of water the filter can treat during its entire lifespan. This is a theoretical reference value and is significantly affected by the quality of the source water. For example: 2000 gallons, 4000 liters.
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Recommended Replacement Period
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6 months
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Based on average water quality and usage frequency, this is the suggested time for replacement. Even if the water treated amount hasn’t been reached, it is advised to replace the filter after this period, as saturated activated carbon may become a breeding ground for bacteria.
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Applicable Water Pressure
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xx - xx MPa (or psi)
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The water pressure range in which the filter can operate normally. Typically, municipal tap water pressure (0.1-0.4 MPa) falls within the applicable range.
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Applicable Water Temperature
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5 - 38°C
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The normal operating temperature range for the filter. Hot water should be avoided as high temperatures can damage the filter materials and seals.
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Pressure Drop/Water Flow Rate
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xx psi / xx LPM
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Pressure Drop: The pressure loss value after water flows through the filter; the smaller the value, the better, indicating less impact on water pressure. Water Flow Rate: The amount of water produced per unit of time, influencing the speed at which water is filtered.
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Quality Levels and Identification Standards
The quality of composite filters varies significantly, mainly in materials, processes, and certifications. This is the dividing line between high-end products and cheap alternatives.
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Quality Dimension
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Low-Quality Filter
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High-Quality Filter (such as what you should choose)
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Activated Carbon Material
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Uses ordinary or regenerated carbon, with weak adsorption capacity and small adsorption volume, potentially releasing impurities.
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Uses high-quality coal-based or coconut shell activated carbon (larger surface area, more developed pores, stronger adsorption, and purer).
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Activated Carbon Process
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Simple particle filling, prone to forming water flow channels ("short circuits"), resulting in insufficient filtration.
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High-density compressed sintered molding (our product). The carbon block structure is dense, forcing water to pass through countless micropores, extending contact time, increasing adsorption, and improving efficiency.
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Safety
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Materials may not meet food-grade standards, with risks of leaching harmful substances (e.g., silver ions, plasticizers).
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All materials comply with FDA standards, ensuring material safety and no secondary contamination.
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Third-Party Certification
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No certification, performance based solely on the manufacturer's claims.
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Certified by NSF/ANSI standards, which is the highest guarantee of quality.
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Structural Integrity
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Rough workmanship, poor sealing, potential "water flow bypass," allowing unfiltered water to escape through gaps.
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Precision manufacturing, reliable sealing, ensuring all water passes through the filter thoroughly.
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Core Quality Markers: NSF Certification
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NSF/ANSI 42: Taste Effect – Certifies the filter’s ability to remove chlorine and particles and improve taste and odor.
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NSF/ANSI 53: Health Effect – Certifies the filter’s ability to remove specific health contaminants (e.g., lead, volatile organic compounds, mercury).
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NSF/ANSI 401: Emerging Compounds – Certifies the filter’s ability to remove trace amounts of drugs, pesticides, etc.
The composite filter is NSF 42 and 53 certified, indicating that it has been internationally recognized for improving taste and removing harmful substances.
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