Water Treatment

GeoSIL is a unique and powerful disinfectant developed in Switzerland, and is used extensively for water treatment in Europe, the United Kingdom, and recently North & South America. It controls bacteria, viruses, algae and fungi and significantly reduces biofilm. Its intensive formula also helps to reduce your environmental footprint by eliminating harmful toxins expelled into the environment. GeoSIL water treatment technology is trusted worldwide.

Broad-Spectrum Efficacy


  • Biofilm
  • Filament-Forming Bacteria
  • Sulphate-Reducing Bacteria (SRB)
  • Microbiologically Influenced Corrosion (MIC)
  • Kills Legionella, Pseudomonas, Salmonella and E.Coli

No known bacterial resistance.

Effective at a wide range of water temperatures and pH values.

Chemically and Structurally Compatible

  • Chemically compatible with other biocides
  • Significantly less corrosive than Chlorine, Bromine and Peracetic acid


  • Clear and odorless
  • Does not contain chlorine, hypochlorite (bleach), alcohol, aldehydes, phenols, formaldehyde, ammonium compounds, quats or sodium hydroxide
  • Not carcinogenic or mutagenic

Environmentally Friendly

Does not contain:

  • AOX-forming substances (Absorbable Organic Halogen Compounds, usually chlorine),
  • VOC's (Volatile Organic Compounds)
  • Formaldehyde, acid or any other toxic byproducts
  • Completely decomposes into water and oxygen
  • Not detrimental to wastewater or to the environment

Rainwater Tanks

GeoSIL provides the ideal safe way to treat day to day infection associated with rainwater storage tanks. It is also suitable for surface water from springs, streams and ponds, and can be used for portable water supplies found in boats, caravans, and mobile homes.
PDF file (380kb)
Tank Treatment Q & A PDF(107kb)
Instructions for Use PDF(70kb)

Water Tank Cleaning

GeoSIL is the ideal product to disinfect not only the water in the tank, but the tank internal surface, and the water distribution system as well. Periodic cleaning and dosing with GeoSIL is a highly effective and safe method of ensuring safe water systems.
Contact GeoSIL Pacific for further details.

Didymo Control

Because GeoSIL is non toxic, tasteless, odourless, and fully bio-degradable, it can be safely used to treat infected boats fishing equipment, clothing etc., with the knowledge that any discharge water from the cleaning process willl not pollute waterways or groundwater supplies. These are unique features of GeoSILâ that distinguish it from many traditional disinfectants.
PDF file (447kb)

Legionella Control

The effectiveness of GeoSILâ comes from its ability to not only destroy the Legionella bacteria, but also to break down and remove biofilm buildup in water systems. Without biofilm, bacteria, including Legionella, are unable to build up and multiply to a level that threatens the health of the system. In addition, this increases the ability of the system to resist re-contamination.
PDF file (396kb)

Cooling Towers & Air Conditioning

Information on request.

Ice Making Plants

Information on request.

Swimming Pools & Spas

Information on request.