What does filter sand mean in practice?
Appropriately selected granulation creates a layer with predictable resistance and the ability to retain suspensions during depth filtration.
When does it matter?
Construction sand or unwashed sand may introduce dust and impurities, and incorrect grain distribution worsens hydraulics.
Which solutions are related to it?
The material used is washed, sorted and approved for the purpose, placed on the support layers and rinsed thoroughly after backfilling.