Aqua-Techniek B.V.
Nijverheidsweg 15a
3225 LL Hellevoetsluis
The Netherlands

Aqua-gravel / Coarse silica sand, Support layer

Aqua-gravel is a 100 % natural silica sand, through an elaborate refining process, together with constant quality control, elevated to a top quality media - free of clay, dust, organic matter or any other contamination, thus meeting all inter­national standards.



  • under Aqua-sand and/or Aqua-sand and Aqua-cite, in order to:
  • prevent losses of fine media through the nozzle system,
  • evenly distribute the backwash media water and/or air over the filter area.

Chemical analysis


EN 12904
Type 1

SiO2mass-%> 97> 96
Fe2O3mass-%< 1< 2
Al2O3mass-%< 1< 3

Physical characteristics


EN 12904
Type 1

Densityg/cm32.62.5 - 2.8
Bulk densitykg/m315001400 - 1700

Acid solubility

24 h in 20% HCl

mass-%< 1< 2
Shape round, spherical
Colour white, white to yellow
Sizes available Sizes to all international standards upon request.



  • 25 kg PE-bags, palletised and shrink-wrapped,
  • Big bags,
  • Bulk-carriers.
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