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We do acid washing on our carbons and regeneration as well, but our current barren carbon loading is very high compared to the previous loadings. This is a major worry now since our protocols are still being followed as before. I want to know, in the attempt to do acid washing can the carbons be fouled? Or can a decrease or increase in the acid solution lead to fouling because we have done all the necessary calcium and other organic foulant tests and they are within acceptable limits as before. Our barren before recent results were within 30-50ppm but now we are recording about 120-200ppm on the barren carbons. Please i need help as soon as possible. Currently we use the AARL stripping process for our elution.