AFM® Grade 3 is a coarse‑support layer filter media designed primarily to sit over laterals in sand or glass filter systems. Its 2‑4 mm grain size ensures even water distribution and efficient backwash flow without impeding filtration. Certified to NSF / ANSI standards, this Grade 3 media offers robustness, long service life, and contributes to improved filter performance while using recycled glass materials.

• Key Features

• Grain size: 2.0‑4.0 mm (coarse Grade 3)
• 25 kg bag—sufficient for support layer in standard filters or to cover laterals uniformly
• Made from recycled glass, carefully activated for bioresistance and stability
• Certified under relevant NSF/ANSI / Drinking Water / Material safety standards
• High sphericity and tight size distribution for flow uniformity

✓ Benefits

✓ Promotes even water flow and reduces dead zones in filter beds
✓ Improves backwash efficiency by preventing compaction over laterals
✓ Durable and long‑lasting; minimal replacement required
✓ Compatible with AFM Grade 0‑2 and other filter media as a layering material
✓ Eco‑friendly choice using recycled glass and certified manufacturing

Technical Specifications

• Particle Size Range: 2.0‑4.0 mm

• Effective Size (d10): approx. 2.3 mm 

• Uniformity Coefficient (d60/d10): ~1.4‑1.8 

• Bulk Bed Density (uncompacted): ~1.43 kg/L 

• Porosity (uncompacted): ~42% ±2% 

• Hardness: ~5.5‑7.0 Mohs

• Bag Weight: 25 kg

What You Get

1 × 25 kg bag of AFM® Grade 3 (2‑4 mm) supported filter media