At one of our plants we are regularly seeing a pink tinge or worse in our sodium hypochlorite solution. The chemical is tankered in from a supplier , but the same supplier and often the same tanker goes to our other plants and the problem is not apparent there. The solution in the tank has a slight yellow color about it as usual but when we collect a sample from the dose pump manifold bleed point it often has a pink or red color in the solution. We thought for a start that the hypochlorite had leached the color out of the thread seal tape but this has been happening for some time now.
Does anyone have a suggestion about the cause of this?
"Any water can be made potable if you filter it through enough money"
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