Legionella Control & Prevention

We are a distributor of the chemical Tiosan.

Tiosan is a formulation developed in Holland as a disinfectant. The chemical is based on hydrogen peroxide, which has been stabilised and catalysed by colloidal silver in minute quantities. Tiosan is based on a chemical, which has approval from the Secretary of State for the Environment for use in potable water systems in the United Kingdom. The formulation has proven efficacy against biofilm because the formulation can attack biofilm chemically and mechanically.

Extensive testing on the continent has shown that a 24-hour treatment at 50 ppm hydrogen peroxide will remove all traces of biofilm and Legionella from a water system. The Safewater System uses 75 ppm to ensure the water system can be used over the 24 hour period. A second treatment 6 months later will ensure that the system remains free of biofilm.

Treatment using Tiosan depends on maintaining an average of 50 ppm hydrogen peroxide over 24 hours. This means that water can be used for washing hands and flushing toilets but not for running baths or washing cars as this would cause dilution of the chemical.

From a practical viewpoint the chemical should be added to water systems immediately after morning baths in a nursing home or after 9 am in most hotels.

In situations where it is not practicable to ensure minimal dilution viz small storage tank coupled with large systems throughput, Tiosan should be added over 24 hours to the system using a small timer controlled pump.