Is there a difference between the citric acid you would buy at a grocery store like Millard Citric Acid, and what BRS sells? I am assuming no, but am more wondering about the dilution ratio. Brs citric acid says 3/4 cup citric acid to 1 gallon of water. I do not know if Millards is the same strength or concentration? Grocery store citric acid is WAY cheaper. I mean I can get 10 pounds of Millards for the same price as 3 pounds of BRS. And I would like to clean some pumps. Thanks