Products & Materials

Vegetation Soil for LID

Choc-Choc Soil summary

Choc-Choc Soil is the most important factor along with vegetation in bio-retention, and serves as a vegetation base and water storage. The stored water is used for activating soil microorganisms and plant growth, thereby reducing rainfall runoff and preventing soil erosion.
In addition, Choc-Choc Soil removes water pollutants by adsorbing heavy metals and nutrients through chemical bonding in the soil.

Principles of Natural Purification Using Plants and Soils

Choc-Choc Soil Characteristic

  • Better self-vacuum than sand or general vegetative soil, effectively providing habitat for microorganisms
  • Provide adequate penetration speed (if too fast, water purification function will be lost; if too slow, clogging will progress)
  • Support for vegetation and soil biological groups (creating ecosystems in bio-retention to prevent biological purification and occlusion)
  • Provides water treatment (Adsorption, filtration, biological decomposition)
  • Adsorption of heavy metals and removal of nutrient salts (P) by cation exchange
  • Engineered Soil
  • Ensuring breathability, moisturizing, and tightening


  • LID-related
  • Tree Box Filter
  • Planter Box
  • Rain Garden
  • Vegetative place


Choc-Choc Soil (Vegetation Soil for LID)
Chemical properties
Category Content
Acidity(pH) 5.0~7.0
Electrical Conductivity (E.C) Less than 2.0 dS/m
For base substitution (C.E.C) 6 cmol/kg or more
Substitutable potassium (K+) 0.6 cmol/kg or more
Substitutable Calcium (Ca++) 2.5cmol/㎏ or mor
Substitutable Magnesium (Mg++) 0.6cmol/㎏ or mor
Salt concentration less than 0.2%
Physical Properties
Category Content
Effective moisture content 0.2~0.12㎥/㎥
Porosity 1.0~0.5㎥/㎥
Permeability 1.38x10-3cm/s
Soil hardness 21mm or less

Saturn classification by sand, mass and clay ratio

Conditions for choc-choc Soil (bioretension soils)

  • It should be manufactured to maintain the function of bio-retention by selectively mixing sand, clay (powder), and soil organic matter (compost).
  • In general, soil defined as loam, sandy loam, and high quality loam are used to meet the performance goals of bio-retention soils, and used in combination with other ingredients to maintain vegetation and create a biological environment
  • Organic substances used in bio-retention soils should not contain axons, human flour, etc