Certified Reference Materials (CRMs) are used in laboratories to validate methods,

 Certified Reference Materials (CRMs) are used in laboratories to validate methods, calibrate equipment, and evaluate personnel performance. They are also used to establish standards of traceability and document the accuracy of analysts. CRMs are used in many industries, including water treatment, food and beverage manufacturing, and environmental testing. 

Here are some CRMs for water analysis:

ERA Certified Reference Materials: Offers organic, inorganic, and radiochemistry CRM standards. 

BiosistoStandard: CRMs meet ISO 17025 and NPR 6268 standards. 

Lab-Elite Certified Reference Material: Microorganisms are delivered in a KWIK-STIK format and come with a Certificate of Analysis. 

CRMs can be used to: 

Validate new test methods or cleaning methods

Calibrate laboratory equipment

Evaluate the performance of laboratory personnel

Establish standards of traceability

Support root cause analysis of laboratory deviations

Identify the source of an error

Prove and document that corrective action is effective