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Below -3 hypo doesn't work

Well they say that but it does at stronger ratios but not very effective and means using stupidly high concentrations of bleach 

No idea about ddac or benz biocidal wash as you will know it but the cold will effect any chemical reaction

 
Technically hypo doesn’t work so well below 10 degrees , we did a job earlier this year at -2 with 3 month out of date hypo it took longer than if it was warmer but the end result was the same mix strength was very slightly stronger 

 
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