Filter Gravel
Graded silica gravel used as a support layer in filter beds. Available in 1–3 mm, 2–3 mm and 3–5 mm classes.
What is Filter Gravel?
Filter gravel is a graded silica gravel with high abrasion resistance, used in the lowest layer of water-treatment beds. In slow and rapid sand-filter systems it carries the filter sand as a support layer and regulates drainage. Compliant with TS EN 12904, it is produced washed and screened at our facilities in the Trakya region.
Filter gravel is a high-SiO₂ silica gravel that acts as a support layer in filter beds, graded into 1–3 mm, 2–3 mm and 3–5 mm classes. With a typical SiO₂ content of 96.3%, its high abrasion resistance and chemical stability allow it to be laid beneath the filter sand to ensure even distribution and collection of the water. Its washed, dust-free structure delivers stable bed performance during backwashing.
Technical summary & chemistry
Values are taken from real batch analyses; an up-to-date batch report is provided with every shipment.
Technical Summary
- Grain size
- 1–3 mm / 2–3 mm / 3–5 mm
- Certificate
- TS EN 12904
Chemical Composition
- SiO₂
- 96.3%
- Fe₂O₃
- 0.18%
- Al₂O₃
- 0.77%
- Moisture
- 0%
- LOI (loss on ignition)
- 0.02%
- Hardness (Mohs)
- Mohs 7
- Density
- 2.65 g/cm³
- Sintering point
- 1500 °C
Where is it used?
Laid beneath the filter sand in layers of different sizes to ensure even distribution of the water and to prevent the filter media from being carried away by the flow.
Provides high permeability and durability in drainage applications.
Improves filter efficiency as a lower support layer in rapid and slow sand filters.
Fractions & sieve analysis
Produced in 9 controlled gradations. Click each fraction to see its sieve analysis (retained %).
Fraction
9 fractionsAbout Filter Gravel
What is filter gravel used for?
It acts as a support layer in the lowest part of filter beds; it carries the filter sand, ensures even distribution of the water and prevents the filter media from escaping with the flow.
What sizes is filter gravel used in?
Depending on the bed structure, the 1–3 mm, 2–3 mm and 3–5 mm classes are laid in layers from fine to coarse.
Are filter gravel and filter sand used together?
Yes. The filter gravel forms the lower support layer and the filter sand forms the upper filtration layer.
What can you rely on?
Batch-based analysis
Grain size and chemical composition are reported with every shipment.
Consistent quality
Production at our own facility; consistent batch-to-batch results.
Flexible packaging
Bulk, big-bag or sack — delivered to suit your requirement.
Free sample
We provide a sample and technical support before you decide.
Consider together
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