Characteristic

• It is standardized after crushing rocks and mixed with
  calcined oyster shells and can perform optimal filtering
  and adsorption functions.
• It can maintain the surface roughness and voids suitable
  for the attachment of microorganisms.
• The typical grain size of the filter sand is 2 to 5mm,
  and it can be used semi-permanently.

Characteristic

• Provision of habitat for denitrification microorganisms
  in constructed wetland type water purification facilities
  after proper mixing of loess, oyster shell, sulfur, etc.
• Improved phosphorus removal rate with abundant cations,
  improved denitrification rate by autotrophic
  microorganisms despite lack of carbon source
• High durability as a calcined product with a typical grain
  size of 20 to 25 mm

Characteristic

• A porous lightweight filter media with high porosity and
  excellent adsorption capacity as a mixture of bottom ash
  and calcined oyster shells.
• Functional filter media that can be applied to various fields due to its excellent specific surface area and air permeability and a large amount of cationic components.
• The typical grain size of the filler is 2 to 25mm,
  and it can be used semi-permanently.

Characteristic

• In order to improve the porosity and permeability of the
  filter sand for the existing constructed wetlands,
  the filter sand with the fine grain size is minimized and
  the content of the filter sand with the coarse grain size
  is increased.
• The amount of treated water per unit area can be
  increased and the air supply rate to the surface is
  improved, so it can be applied to various fields such as
  non-point source pollution reduction wetland and
  polluted stream purification wetland as well as sewage
  treatment plant.
• The typical grain size of the filter sand is 2 to 8mm,
  and it can be used semi-permanently.