This is a complete WP NELAC Inorganic QC kit. It contains 16 samples for testing Anions, Demand, Minerals, Total Nutrients, Oil & Grease, pH, Residue, Total Cyanide, Total Phenolics, Total Residual Chlorine, and Trace Metals. These QC's are designed to fall between NELAC specified ranges and will have one lot of each sample listed. A detailed certificate of analysis is also included. For sample COAs please click the COA tab.