So my 1998 DME combi tank HLT inside is staining a brownish color. We have softish water with higher bicarbonate at 129. We treat the HLT with lactic acid to decrease PH and also treat with gypsum or calcium carbonate depending on the style of beer. We filled over the weekend with pbw at 140 degrees to soak but today it didnt remove any of the color. . This is the manway and the inside looks just like it.
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