Sentence:  There are a lot of varieties of diatomaceous earth, so when you are shopping, be sure to get the right stuff!/ / Make sure that you get food <WSD>grade</WSD> diatomaceous earth. Some people make 3% of the food they eat be diatomaceous earth. 
Meaning of the word marked with <WSD> tags:  A degree or level of something; a position within a scale; a degree of quality.