In addition to unmanipulated animal and vegetable manures and organic waste-derived materials, the following materials are exempt from the definition of commercial fertilizer:

(1) Unpackaged biosolids if they comply with biosolids regulation under chapter 173-308 WAC, and they do not use the term "fertilizer" in the labeling of the biosolids, except to disclaim them as commercial fertilizer;

(2) Packaged biosolids if they do not meet the definition for commercial fertilizer, do not use the term "fertilizer" in the labeling of the biosolids, except to disclaim them as commercial fertilizer, and comply with biosolids regulation under chapter 173-308 WAC.