Biocides & Disinfectants

The water within a cooling system provides optimal growth conditions for many species of bacteria, including Legionella spp. The warm environment and high levels of organic debris make for a particularly pleasant environment for rapid bacterial growth if this is left uncontrolled.

Legislation requires that cooling towers must prevent the proliferation of Legionella bacteria within these systems as a precaution against the outbreak of Legionnaires disease. It is therefore critical that the correct biocidal treatment regime is implemented and regular checks are carried out to ensure that bacterial populations within the system are kept under control.

Biocides can be divided into 2 main groups

Oxidising Biocides

Oxidising biocides simply oxidise microbial cells and will kill micro-organisms including bacteria, algae, fungi and yeasts

Non-Oxidising Biocides

Non-oxidising biocides kill microorganisms typically by disrupting the organism's metabolism or damaging the cell wall

Biodispersants do not kill organisms but they do break up any deposits of microorganisms allowing the biocides to attack the organisms more effectively. They also inhibit the attachment of microorganisms to metal surfaces.

Oxidising Biocides

Product codeCompositionComments
ST102Sodium HypochloriteSodium hypochlorite 14/15%
ST5414/15% sodium hypochlorite + biodispersantA chlorine-based biocide for the treatment of cooling towers. Dosed 1:1 with BV1422 to generate hypobromous acid
ST1422Sodium Bromide solutionA solution of sodium bromide for the treatment of cooling towers. Dosed 1:1 with BV54 to generate hypobromous acid.
ST138Concentrated sodium bromide sdolutionA solution of sodium bromide for the treatment of cooling towers. Dosed 1:3 with BV54 to generate hypobromous acid.
ST476Bromine tabletsA mixture of brominated and chlorinated hydantoins.Releases both bromine and chlorine in the form of hypobromous acid and hypochlorous acid. The product should be dosed using a purpose built brominator to ensure good dose control.
ST923A stablised hypobromite solutionStabilised Bromine biocide. Single dose product. For use as a biocide in the treatment of cooling towers. Dose 15ppm product to give 1-2ppm bromine.

 

Non-Oxidising Biocides

Product codeCompositionComments
ST63Concentrated THPS based biocide & biodispersantLow toxicity. Excellent against Pseudomonas spp, Legionella spp and algae. Concentrated formulation. The biodispersant in the formulation enhances biocidal activity, removes biofilm and prevents the formation of additional biofilm.
ST1531ITA blendA highly effective broad spectrum biocide. Effective against Legionella.
ST105BNPA broad-spectrum bactericide. Low toxicity. Effective against Legionella.
ST1507GlutaraldehydeHas a broad spectrum of activity against bacteria and their spores, fungi, also effective against Legionella spp. Rapid biocidal action. Concentrated product.
ST1528ProprietaryA highly effective non-oxidising biocide containing a synergistic combination of biocides. Ideal for use in closed circuit or open cooling systems. Effective against, Pseudomonas spp and Legionella spp.
ST529DBNPAHas a broad spectrum of activity against bacteria and their spores, fungi, also effective against Legionella spp. Rapid biocidal action.
ST67Quaternary ammonium chlorideA broad spectrum disinfectant and biocide. Effective against Legionella. Effective in heavily soiled systems. Good surfactant properties. Rapid biocidal action.
ST66Contains a polymeric quaternary ammonium compoundVery effective algaecide for use in open cooling systems and swimming pools
ST14Concentrated biodispersantExtremely low foaming. Improves the effectiveness of any biocide programme.
ST963BiodispersantExtremely low foaming. Improves the effectiveness of any biocide programme.