1.18–2 mm (10/16) Natural Sand Filter Media
The 1.18–2 mm (10/16) natural sand filter media is a meticulously graded, high-purity granular material designed primarily for use as a support or intermediate layer in multi-media and deep-bed filtration systems, as well as a standalone coarse sand filter. Sourced from naturally occurring silica deposits, this sand exhibits excellent uniformity and a high silica content, ensuring optimal hydraulic characteristics and long-term chemical stability. Its specific grain size facilitates efficient particulate removal while maintaining superior permeability, making it ideal for robust water purification applications where both filtration efficiency and drainage are critical. This size is used by the railways for wheel to rail traction.
Grain Size: 1.18–2 mm
Precisely graded to serve as a coarser sand layer or an intermediate support for finer filter media.
Specific Gravity: ~2.65 g/cm³
Provides stable bed formation and resistance to hydraulic lift during backwash, ensuring filter integrity.
Effective Size (D10): 1.2 to 1.5 mm
Ensures consistent filtration performance and adequate flow rates with minimal head loss.
Uniformity Coefficient (UC): ≤ 1.4
Guarantees excellent particle size consistency, preventing channeling and promoting uniform flow distribution across the filter bed.
Composition: High-purity natural silica quartz sand (SiO₂ content typically >95%); contains minimal impurities such as clay, iron oxides, or organic matter.
Intermediate Layer in Multi-media Filters:
Acts as a crucial transition layer, supporting finer filter sands (e.g., 0.45–0.55 mm) above coarser gravel layers or larger sands.
Coarse Sand Filtration Systems:
Effective as a primary filter medium for removing larger suspended solids, turbidity, and sediment in certain water treatment designs.
Underdrain Protection:
Used directly above gravel support layers to prevent finer media from migrating into the underdrain system.
Industrial Process Water Filtration:
Ideal for pre-treatment in various industrial applications requiring robust filtration of raw water sources.
Municipal Water Treatment Plants:
Employed in rapid gravity filters and pressure filters as a foundational sand layer for large-scale water purification.
Wastewater Treatment (Tertiary Filtration):
Used in post-biological treatment stages for final suspended solids removal.
Aquaculture and Pond Filtration:
Provides effective mechanical filtration for maintaining water clarity and quality in aquatic environments.
✅ High Purity Silica Content – Ensures chemical inertness and prevents leaching of undesirable substances into filtered water.
✅ Optimized Filtration Performance – Precisely graded for efficient removal of suspended solids while maintaining good hydraulic flow.
✅ Excellent Hydraulic Characteristics – Promotes uniform flow distribution and efficient backwashing, reducing operational costs.
✅ Exceptional Durability – Hard-wearing and resistant to attrition, providing a long service life with minimal degradation.
✅ Chemically Stable – Highly resistant to acids, alkalis, and biological fouling, suitable for diverse water chemistries.
✅ Pre-Washed & Ready to Use – Minimizes on-site preparation, ensuring low turbidity during initial filter startup and commissioning.
Typically installed as an intermediate layer above coarser gravel or pebble support media in multi-media filters.
Can also be used as the primary filter medium in certain coarse sand filter designs.
Recommended bed depth varies from 300–600 mm, depending on the specific filtration system design, raw water quality, and desired effluent standards.
Careful layering is essential to prevent intermixing with adjacent media sizes during installation and backwash.
Always perform a thorough backwash and rinse cycle after initial installation to settle the bed and remove any residual fines before putting the filter into service.
Packaging: Available in robust 50 kg HDPE woven bags for convenient handling and storage, or in larger 1-ton jumbo bags for bulk procurement.
Form: Supplied as rigorously pre-washed, carefully oven-dried (upon request), and precisely size-graded natural sand, ensuring optimal quality and consistency.
Supply: Available in bulk quantities to cater to the requirements of industrial, municipal, aquaculture, and various commercial filtration projects.
Conforms to: IS: 8419 (Indian Standard for Filter Media), AWWA B100 (American Water Works Association Standard for Granular Filter Material), and NSF/ANSI Standard 61 (Drinking Water System Components – Health Effects) when applicable, ensuring its suitability for various water treatment applications, including potable water.
Quality Assurance: Every batch undergoes strict quality control procedures, including detailed size analysis, specific gravity determination, and acid solubility tests, to guarantee consistent performance and adherence to international specifications.