We have very hard water, and when the dishwasher detergent companies took out the phosphorus in their products, it left our dishes with a white spotted film all over them. I researched and found a product called Lemi-shine. It worked but was very expensive to use on a regular basis. I researched a little more and found that it was just a citrus-derived acid. So adding a tablespoon of citric acid to our dishwasher at each load does the same thing. I buy it here on Amazon because it is the least expensive. This brand in more fine than the Spicy World brand which makes for easier pouring and is slightly less expensive. I thought about buying a chemical grade, but thought for dishes food grade is more appropriate. Works like a charm and my dishes are sparkling clean again!