Silver Impregnated Activated Carbon
Coconut shell GAC with bacteriostatic silver coating for drinking water, medical filtration, and food-grade applications. NSF/ANSI 42 & 61 compliant.
Product Overview
Silver impregnated activated carbon uses ultra-low concentrations of metallic silver deposited on high-quality coconut shell granular carbon to provide bacteriostatic protection. The silver prevents bacterial colonization of the carbon bed, ensuring safe, clean-tasting water throughout the filter's service life.
Our silver-loaded GAC is manufactured using a proprietary wet impregnation process that ensures uniform silver distribution without blocking micropores. The result is activated carbon that retains its full adsorption capacity while gaining long-lasting antibacterial properties.
Key Applications
- POU/POE drinking water filters
- Refrigerator water cartridges
- Medical & dental water systems
- Food & beverage processing
- Swimming pool & spa filters
- Aquarium filtration
- Household pitcher filters
- Vending machine water systems
Compliance & Certification Requirements
| Standard | Requirement |
|---|---|
| NSF/ANSI 42 | Chlorine taste & odor reduction |
| NSF/ANSI 61 | No harmful extractables into drinking water |
| WHO Ag guideline | Silver in drinking water ≤ 0.1 mg/L |
| Silver loading on our GAC | 0.05 – 0.1% by weight |
| Silver leach rate (typical) | < 0.01 mg/L in effluent |
| Bacteriostatic test method | JIS Z 2801 / EPA protocol |
| Bacterial reduction (ASTM) | > 99.9% (3-log) E. coli |
Third-party NSF/ANSI 42 & 61 test reports available on request for OEM filter manufacturers. We can match specific Ag loading to your NSF-certified filter spec.
OEM Refrigerator Filter Manufacturer — 12×40 Ag-GAC, South Korea
A major appliance OEM building NSF/ANSI 42-certified refrigerator water filters sources 12×40 silver-impregnated coconut shell GAC for their cartridge fill. The 0.07% Ag loading provides bacteriostatic protection for the 6-month filter life (200 gallons rated capacity). Silver leach in effluent was verified at 0.003 mg/L — well below the WHO 0.1 mg/L guideline — during third-party NSF testing. Hojee supplies 15 MT/month under private label.
Technical Specifications
| Model | HojeeAqua Ag-Series |
| Impregnant | Metallic Silver (Ag) |
| Silver Loading | 0.01 – 0.3% by weight |
| Base Carbon | Coconut shell granular |
| Mesh Size | 8×30 / 12×40 / 20×50 |
| Iodine Number | 1000 – 1200 mg/g |
| Hardness | > 97% |
| Ash Content | < 5% |
| pH | 6 – 8 (neutral) |
| Moisture | < 5% |
| Bulk Density | 0.48 – 0.54 g/cm³ |
| Silver Leaching | Meets NSF/ANSI 42 & 61 |
Response within 24 hours
Other Impregnated Products
Why Silver Carbon for Drinking Water
Bacteriostatic, Not Bactericidal
Silver prevents bacteria from colonizing the carbon bed — it doesn't kill bacteria in flowing water. Perfect for POU filters where re-growth between uses is the real risk.
Coconut Shell Base
Higher micropore volume vs coal base — delivers better chlorine, taste and odor performance alongside bacteriostatic protection. Critical for NSF 42 compliance.
Controlled Ag Leach
Our wet impregnation process fixes silver in stable oxide form. Leach rate verified <0.01 mg/L — well below the WHO 0.1 mg/L drinking water guideline.
OEM-Ready
Test reports for NSF/ANSI 42 & 61 available. Custom mesh sizes (8×30, 12×40, 20×50) for cartridge fill. Private label packaging supported.
Packaging Options
Sealed PE-lined bags
Standard export, palletized
Jumbo bags
Bulk with pallet, forklift ready
Super sacks
Large-scale industrial
OEM packaging
Your brand, free design
Frequently Asked Questions
Is silver impregnated carbon safe for drinking water?
How does silver prevent bacterial growth?
Drinking Water Grade Carbon
NSF-compliant silver-impregnated GAC for OEM filter manufacturers. Free samples available. MOQ 3 tons.
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