The proficiency testing studies help improve quality and comply with regulations. Order the NSI PT Express™, our on-demand proficiency testing, when you have an immediate need for proficiency test results.

These environmental chemistry wastewater proficiency tests are designed for identification of target chemicals in wastewater.

Environmental Chemistry Wastewater PT Express samples may take 7 to 10 business days to ship. If you need the samples sooner, please call NSI at 1-800-234-7837 to expedite your order.

For determination of the following elements:
Calcium: 10 to 100 mg/L
Magnesium: 4.0 to 40 mg/L
Total hardness: 40 to 415 mg/L
Calcium hardness: 25 to 250 mg/L