20–25 mm Natural Pebbles Filter Media

The 20–25 mm natural pebbles are large-sized granular filter media primarily used as the final base support layer in deep-bed and multi-layer filtration systems. These rounded or semi-rounded silica-based pebbles form the foundation of the filter bed, providing maximum stability, robust drainage, and support for upper media layers such as sand, anthracite, and finer gravels. Their inert and hard-wearing nature makes them ideal for use in high-load, high-flow industrial and municipal filtration setups.

Key Properties:

- Grain Size: 20–25 mm
  Designed to function as the coarsest and bottommost filter support layer.
- Specific Gravity: ~2.6 g/cm³
  Offers mechanical stability under high operational pressures.
- Effective Size (D10): 20 to 23 mm
  Ensures excellent drainage and no clogging at the outlet.
- Uniformity Coefficient (UC): ≤ 1.6
  Guarantees consistency and even packing throughout the filter bed.
- Composition: Naturally sourced silica-rich quartz pebbles; low in impurities, iron, clay, and organic matter.

Applications:

- Support Layer in Multi-media Filters
  Acts as the deepest layer, supporting 12–20 mm or 6–12 mm gravels above.
- Industrial Water Treatment Plants
  Provides foundational media for filters handling large flow volumes and high solids.
- Municipal Water Filtration Units
  Used in large-scale rapid gravity and pressure filters.
- Effluent & Sludge Filtration
  Offers strong structural support in high turbidity environments.
- Aquaculture and Reservoir Filtration
  Prevents clogging and ensures free flow of filtered water through the system.

Advantages:

✅ Excellent Load-Bearing Capacity – Perfect for heavy-duty filtration systems.
✅ Naturally Inert & Non-toxic – Safe for potable and process water systems.
✅ Superior Drainage Support – Prevents filter bed compaction or backwash channeling.
✅ Long-lasting & Chemically Stable – High resistance to acid, alkali, and biological degradation.
✅ Graded, Cleaned & Ready to Use – Ensures minimal turbidity during commissioning.

Installation Guidelines:

- - Used as the deepest or foundation layer in multi-media filters.
  - Recommended bed depth: 150–300 mm, depending on system size and design.
  - Layered below 12–20 mm or 6–12 mm gravel, forming the filtration pyramid.
  - Must be thoroughly washed before installation to eliminate silt or fine particles.

Packing & Supply:

Packaging: 25 kg / 50 kg HDPE bags or jumbo bags
Availability: In bulk quantities for municipal and industrial projects
Pre-washed & Sieve Graded: Ready to use

Standards Compliance:

Conforms to IS: 8419, AWWA B100, and NSF/ANSI standards (if applicable)
Laboratory-tested for sieve analysis, turbidity reduction, and acid solubility