AFM® NG Grade 1 Glass Filter Media – 0.4-0.8mm (25 kg Bag) NSF Certified

AFM® NG Grade 1 is a top‑tier activated glass filter medium engineered for high precision filtration in pools and water treatment systems. With grain sizes of 0.4‑0.8 mm, it excels at removing very fine particles, including organics, microplastics, and other contaminants, down to around 1 micron. Made from recycled glass and treated to resist biofouling, this media provides long‑lasting, more efficient filtration, lower chemical usage, and improved water clarity and safety.

• Key Features

• Grain size: 0.4‑0.8 mm (Grade 1 NG)
• Bag size: 25 kg
• Made from recycled glass; activated to be hydrophobic and bioresistant
• Certified performance: removes ~95% of particles >1 µm without flocculation
• Fine and uniform particle distribution for consistent flow and filter bed behaviour
• Bulk bed density (uncompacted): ~1.33 kg/L
• High sphericity and low uniformity coefficient for stable filtration

✓ Benefits

✓ Ultra‑fine filtration improves clarity and reduces turbidity
✓ Lower chemical usage due to better removal of organic load and contaminants
✓ Reduced backwash water and energy costs thanks to efficient media behaviour
✓ Improved swimmer comfort—less chloramine and odor formation
✓ Long life span; durable performance under normal operating conditions

Technical Specifications

• Particle Size Range: 0.4‑0.8 mm

• Effective Size (d10): approx. 0.40‑0.43 mm

• Uniformity Coefficient (d60/d10): ~1.3‑1.8 

• Hardness: ~5.5‑6.5 Mohs 

• Bulk Bed Density (Uncompacted): ~1.33 kg/L ± small tolerance 

• Bag Weight: 25 kg

What You Get

1 × 25 kg bag of AFM® NG Grade 1 glass filter media