Soil and groundwater remediation

EHC® Liquid Reagent

EHC® Liquid ISCR Reagent is a concentrated, buffered, microemulsion of a controlled-release, food-grade carbon, nutrients, and iron designed for on-site dilution with cold water.

The product is a liquid variant of EHC® ISCR Reagent and is specially designed for injection via existing wells or hydraulic injection networks for the treatment of a wide range of groundwater contaminants. EHC® Liquid is composed primarily of ELS® Microemulsion, a controlled-release organic carbon substrate and EHC® Liquid mix, an organo-ferrous compound (both food-grade). The anaerobic bioremediation processes and abiotic dechlorination reactions promoted by EHC Liquid are effective at remediating chlorinated solvents, energetics, and pesticides/herbicides.


  • Stimulation of both abiotic and biotic dechlorination mechanisms
  • Structurally bound nutrients phosphorous and nitrogen released to bacteria
  • Anticipated longevity of 2-3 years depending on site conditions
  • Easy to handle and cold water soluble


  • Chlorinated solvents
  • Energetic compounds
  • Most pesticides
  • Haloalkanes
  • Nitrate compounds
  • Chromium

Key functions

  • Direct push injection
  • Gravity feed through existing wells
  • Low pressure injections
  • Recirculation systems


In situ chemical reduction (ISCR) is the combination of abiotic chemical reduction, using zero valent iron(ZVI) and/or reduced minerals (magnetite, pyrite), coupled with anaerobic bioremediation for the effective treatment of chlorinated solvents, pesticides, and energetics. Physical, chemical, and biological processes combine to create an extremely reduced environment that stimulates chemical and microbiological dechlorination of otherwise persistent compounds.

Technical Overview and White Papers

An overview of the different properties, mechanisms, and key attributes of our various reductive technologies.

EHC® Liquid application guides

Mixing guidelines to prepare diluted EHC® Liquid from a 25% concentration for injection.


This presentation will introduce biological and chemical processes in situ, make field comparisons between the biotic approach (ERD) and the ISCR approach, and show how ISCR enhances biological processes in sulfate-rich aquifers.

Evonik’s laboratory created the KLOZUR® field test kit to provide a quick and reliable measurement of persulfate in the field.

There are two different kits available, depending on the activation method used. Each kit is capable of running ten tests and has a measurement range of 1g/L to 100g/L, with a theoretical accuracy of ±1g/L and ±2g/L respectively.

Contact and further information