The phrase "unwanted contaminants" refers to substances or elements that are present in something and are not desired or intended to be there. Full definition
Federal organic standards require organic turkey to be raised on organic feed, providing you with a food that is far less likely to contain unwanted contaminants. (whfoods.com)
The fuel filter removes unwanted contaminants from the fuel system, like water, fungus, bacteria, sediments and other solids. (greasemonkeyintl.com)
One of the reasons we recommend certified organic foods is the much lower concentration of unwanted contaminants in the skins of organic fruits and vegetables, allowing you to enjoy the nutrient richness of the skins without being exposed to the same level of potential contaminants that might be present in non-organic versions of the same foods. (whfoods.com)