SafeSol Ltd and Huwa-San
SafeSol Ltd introduced Huwa-San into the UK legionella control market in 2004 and have used it since that time. The chemical has found steady acceptance since that time as
- a competitor to chlorine for one-off water disinfections and
- a competitor to chlorine dioxide as a continuous dose chemical.
Like all innovative treatments Huwa-San has been opposed by traditionalists, by companies selling competitor disinfectants, and by companies using other me too silver stabilised hydrogen peroxides.
Chlorine Dioxide and Biofilm: The Theory
Chlorine Dioxide can now be made from preformed tablets or can be provided as a dilute solution. However, generally Chlorine Dioxide is made and dosed on site by reacting sodium chlorite solution with hydrochloric acid solution to form the gas which is then dissolved in water in a mix tank. This solution is then dosed into the water stream. There are variations, for example, acid can be formed by passing water through a cation resin and then mixing this with chlorite solution. Some designs prefer to use an in-line mixer to mix the chlorite and acid streams. The bottom line is that all that Chlorine Dioxide must be dosed accurately and safely. I have witnessed a leak of Chlorine Dioxide. It attracted 7 fire engines and produced a plant room full of foam.
All this means that a suitable Chlorine Dioxide system may cost £15,000 to £20,000. Huwa-San is dosed using a conventional dosing set costing 25% of this
We now have over 15 years’ experience of continuous dosing of Huwa-San. In hundreds of different situations across several industries (water treatment, animal drinking water, crop irrigation swimming pools) There have been no recorded cases of system corrosion, caused by Huwa-San.
Huwa-San is a better continuous dose chemical than Chlorine Dioxide. It is safer, more flexible, and less corrosive. The capital cost of dosing is around 25% of the corresponding Chlorine Dioxide system.