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Sour VII (hydrofluosilicic acid) is Institutional's premier laundry souring agent for controlling high-iron and hard-water conditions. Use Sour VII to help solve result issues from high-iron or hard-water conditions. Sour VII is a very aggressive acid. To prevent linen damage, use a dilution rate of 1-2 ounces per CWT (4 ounces maximum). SEPG reference number: 086435 Qty. Per Pack: 1