4 notes in this chapter.
0–15 mm and 10–25 mm do different jobs in a mix. Dust and salt travel with the fraction.
The same pith lot can pass one lab and fail another if the extract ratio is unnamed.
Tomato, strawberry, and cucumber bags fail for different hydraulic reasons. Name the mix before the sleeve.
A wash removes salt. A buffer exchanges cations. The COA has to say which one you bought.